Ex - 1 Use modal verbs can, may, must in positive or negative forms.
Maybe she will return tonight. - She return tonight.
Don't stand up! - You stand up!
I'm sure they will finish it in a minute. - They finish it in a minute.
Please, do it for me. -
you do it for me?
I'd like to see your children. -
I see your children?
Do your homework! - You
do your homework.
Perhaps she will agree with it. Who knows? - She
agree with it
Don't park your car on bends. It is illegal. - You park your car on b
I want you to tidy the classroom. - You tidy the classroom.
1. We want to be the best. We
practice!​

1 Nowadays, albums are released on CDs.
2 The CD was developed in the 1980s.
3 CDs are used to store music or computer software.
4 CDs are made from plastic and aluminum.
5 Billions of CDs have been sold in the last twenty years.
6 Maybe one day all music will be downloaded from the Internet.
7 But probably CDs will be bought for a few years to come.

67
1 Three languages are spoken by them in Switzerland.
2 The FIFA World Cup was once stolen by thieves.
3 Penicillin was discovered by Alexander Fleming.
4 Everest has been climbed by about 1,500 people.
5 The Nobel Peace Prize is awarded by them every year.
6 Water on Mars has been discovered by them.

1) The robbers haven't stolen our TV.
2) The robbers didn't steal our TV last night
3) I don't usually have breakfast at 10.00
4) We weren't watching TV when the storm…
5) I don't believe they will split up
6) Mary wasn't very bored during the English lesson
7) The students aren't lazy

1) Have the robbers stolen our TV?
2) Did the robbers steal our TV last night?
3) Do you usually have breakfast at 10.00?
4) Were we watching TV when the storm?
5) Do you believe they will split up?
6) Was Mary very bored during the English lesson?
7) Are the students lazy?