Choose the correct options. Sometimes more than one option is possible
1 Modal verbs can refer to
present;
past:
future;
all stated above.
2 If followed by a bare infinitive, modal verbs refer to
a complete action or state
an uncompleted action or state
3 If followed by a perfect infinitive, modal verbs refer to
a complete action or state
an uncompleted action or state
4 Choose a true sentence
All modal verbs don't take any endings.
Some modal verbs need endings.
5 In interrogative sentences
All modal verbs don't take any endings.
Some modal verbs need endings.
6 In negations
most modal verbs are followed by not
not is added to the auxiliary verbs in some cases
not goes before the subject.
​

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1. Modal verbs can refer to present, past, future, and all of the options listed above. Modal verbs are a special type of verb that express possibility, ability, necessity, or permission. They do not change their form to indicate time (present, past, future) and can be used to talk about any time period.

2. If followed by a bare infinitive, modal verbs refer to an uncompleted action or state. Bare infinitives are the base form of the verb without the word "to". For example, "can swim", "may come", "should go", etc. When a modal verb is followed by a bare infinitive, it indicates that the action or state is ongoing or not yet completed.

3. If followed by a perfect infinitive, modal verbs refer to a complete action or state. Perfect infinitives are formed by using "have" + past participle (e.g., have eaten, have seen, have studied, etc.). When a modal verb is followed by a perfect infinitive, it indicates that the action or state has been completed.

4. The true sentence is "Some modal verbs need endings." Modal verbs are generally followed by the base form of the verb (bare infinitive), but some of them, such as "can" or "could", can also be followed by the ending "-s" in certain cases. For example, "He can swim" (with the ending) versus "They can swim" (without the ending).

5. In interrogative sentences, some modal verbs need endings. When forming a question with a modal verb, the verb is inverted with the subject. For example, "Can you swim?" or "Do you need help?" In these cases, the modal verb "can" and the auxiliary verb "do" are followed by the subject and take the appropriate ending.

6. In negations, most modal verbs are followed by "not". For example, "cannot", "should not", "must not", etc. However, there are some cases where "not" is added to the auxiliary verb instead of the modal verb. For example, "don't need", "doesn't want", etc. In these cases, "not" goes before the subject to form a negative sentence.

I hope this explanation helps you understand the role and usage of modal verbs in different contexts. Let me know if you have any further questions!