1. affirmative: My sister tidied her room yesterday.
Explanation: We form the past simple of the verb "tidy" by adding "-ed" to the base form. In this case, the base form is "tidy". The subject of the sentence is "my sister". Therefore, we say "My sister tidied her room yesterday" to indicate that she cleaned her room in the past.
2. negative: My sister didn't tidy her room yesterday.
Explanation: To form the negative past simple, we use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "tidy". So, we say "My sister didn't tidy her room yesterday" to indicate that she did not clean her room in the past.
3. interrogative: Did my sister tidy her room yesterday?
Explanation: To form the interrogative past simple, we begin the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we add the subject "my sister", followed by the base form of the verb "tidy". So, we ask "Did my sister tidy her room yesterday?" to inquire whether she cleaned her room in the past.
B) We lived in London last summer.
1. We lived in London last summer.
Explanation: The base form of the verb "live" is also "live". Therefore, we simply say "We lived in London last summer" to indicate that we resided in London during the previous summer.
2) We didn't live in London last summer.
Explanation: To form the negative past simple, we again use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "live". So, we say "We didn't live in London last summer" to state that we did not reside in London during the previous summer.
3) Did you live in London last summer?
Explanation: To form the interrogative past simple, we start the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we use the subject "you", followed by the base form of the verb "live". So, we ask "Did you live in London last summer?" to inquire whether you resided in London during the previous summer.
C) Sandra and Elsa talked on the phone last night.
1) Sandra and Elsa talked on the phone last night.
Explanation: The base form of the verb "talk" is "talk". Therefore, we say "Sandra and Elsa talked on the phone last night" to indicate that they had a conversation on the phone in the past.
2) Sandra and Elsa didn't talk on the phone last night.
Explanation: To form the negative past simple, we use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "talk". So, we say "Sandra and Elsa didn't talk on the phone last night" to state that they did not have a conversation on the phone in the past.
3) Did Sandra and Elsa talk on the phone last night?
Explanation: To form the interrogative past simple, we begin the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we use the subjects "Sandra and Elsa", followed by the base form of the verb "talk". So, we ask "Did Sandra and Elsa talk on the phone last night?" to inquire whether they had a conversation on the phone in the past.
"Mr. Laton, when did you discover the painting was missing?" - asked the detective.
"When I arrived here at 8 o'clock in the morning," replied Mr. Laton. "It wasn't there when I left last night at 9 o'clock. I think someone took it during the night."
"How long have you been working in this gallery, Mr. Laton?" inquired the detective.
"I started working here last month," Mr. Laton answered.
"Were you home last night?" asked the detective.
"I went to the Rex Cinema with my wife," Mr. Laton explained.
"That is very strange, Mr. Laton. The Rex Cinema was closed last night. In fact, it has been open for more than a week," said the detective suspiciously.
"Oh yes, I made a mistake. I went to the cinema last week. Last night, umm... I forgot?," Mr. Laton stammered.
"Well, I think you have to come to the police station with me, Mr. Laton!" the detective concluded.
In this conversation, the detective is trying to gather information about the missing painting. He starts by asking Mr. Laton when he noticed it was gone. Mr. Laton explains that he arrived at the gallery in the morning and the painting was already missing when he left the night before. The detective then asks how long Mr. Laton has been working at the gallery, to establish his familiarity with the surroundings. Mr. Laton mentions that he started working there last month. The detective further questions Mr. Laton about his whereabouts last night and he admits to going to the cinema with his wife. However, the detective discovers that there is an inconsistency in Mr. Laton's story as the cinema was closed last night. Mr. Laton then confesses his mistake and admits he went to the cinema the previous week. The detective concludes that Mr. Laton's behavior is suspicious and decides to take him to the police station for further questioning.
Explanation: We form the past simple of the verb "tidy" by adding "-ed" to the base form. In this case, the base form is "tidy". The subject of the sentence is "my sister". Therefore, we say "My sister tidied her room yesterday" to indicate that she cleaned her room in the past.
2. negative: My sister didn't tidy her room yesterday.
Explanation: To form the negative past simple, we use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "tidy". So, we say "My sister didn't tidy her room yesterday" to indicate that she did not clean her room in the past.
3. interrogative: Did my sister tidy her room yesterday?
Explanation: To form the interrogative past simple, we begin the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we add the subject "my sister", followed by the base form of the verb "tidy". So, we ask "Did my sister tidy her room yesterday?" to inquire whether she cleaned her room in the past.
B) We lived in London last summer.
1. We lived in London last summer.
Explanation: The base form of the verb "live" is also "live". Therefore, we simply say "We lived in London last summer" to indicate that we resided in London during the previous summer.
2) We didn't live in London last summer.
Explanation: To form the negative past simple, we again use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "live". So, we say "We didn't live in London last summer" to state that we did not reside in London during the previous summer.
3) Did you live in London last summer?
Explanation: To form the interrogative past simple, we start the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we use the subject "you", followed by the base form of the verb "live". So, we ask "Did you live in London last summer?" to inquire whether you resided in London during the previous summer.
C) Sandra and Elsa talked on the phone last night.
1) Sandra and Elsa talked on the phone last night.
Explanation: The base form of the verb "talk" is "talk". Therefore, we say "Sandra and Elsa talked on the phone last night" to indicate that they had a conversation on the phone in the past.
2) Sandra and Elsa didn't talk on the phone last night.
Explanation: To form the negative past simple, we use the auxiliary verb "did" in its past tense form "didn't", followed by the base form of the verb "talk". So, we say "Sandra and Elsa didn't talk on the phone last night" to state that they did not have a conversation on the phone in the past.
3) Did Sandra and Elsa talk on the phone last night?
Explanation: To form the interrogative past simple, we begin the sentence with the auxiliary verb "did" in its past tense form "Did". Then, we use the subjects "Sandra and Elsa", followed by the base form of the verb "talk". So, we ask "Did Sandra and Elsa talk on the phone last night?" to inquire whether they had a conversation on the phone in the past.
"When I arrived here at 8 o'clock in the morning," replied Mr. Laton. "It wasn't there when I left last night at 9 o'clock. I think someone took it during the night."
"How long have you been working in this gallery, Mr. Laton?" inquired the detective.
"I started working here last month," Mr. Laton answered.
"Were you home last night?" asked the detective.
"I went to the Rex Cinema with my wife," Mr. Laton explained.
"That is very strange, Mr. Laton. The Rex Cinema was closed last night. In fact, it has been open for more than a week," said the detective suspiciously.
"Oh yes, I made a mistake. I went to the cinema last week. Last night, umm... I forgot?," Mr. Laton stammered.
"Well, I think you have to come to the police station with me, Mr. Laton!" the detective concluded.
In this conversation, the detective is trying to gather information about the missing painting. He starts by asking Mr. Laton when he noticed it was gone. Mr. Laton explains that he arrived at the gallery in the morning and the painting was already missing when he left the night before. The detective then asks how long Mr. Laton has been working at the gallery, to establish his familiarity with the surroundings. Mr. Laton mentions that he started working there last month. The detective further questions Mr. Laton about his whereabouts last night and he admits to going to the cinema with his wife. However, the detective discovers that there is an inconsistency in Mr. Laton's story as the cinema was closed last night. Mr. Laton then confesses his mistake and admits he went to the cinema the previous week. The detective concludes that Mr. Laton's behavior is suspicious and decides to take him to the police station for further questioning.