Modal auxiliaries im Present Perfect

Wähle die richtige Form im Present Perfect aus.

1. The detective can catch the thief. (Simple Present)
1. The detective catch the thief. (Present Perfect)
2. The students must do a lot of homework. (Simple Present)
2. The students do a lot of homework. (Present Perfect)
3. The students may not go into the London Dungeon. (Simple Present)
3. The students go into the London Dungeloon. (Present Perfect)
4. Lily needn't feed the dog. (Simple Present)
4. Lily feed the dog. (Present Perfect)
5. Jake may buy that computer game. (Simple Present)
5. Jake buy that computer game. (Present Perfect)
6. Ben and Lucy can´t do the exercises. (Simple Present)
6. Ben and Lucy do the exercises. (Present Perfect)
7. The teacher must help them. (Simple Present)
7. The teacher help them. (Present Perfect)
8. They needn't do detention. (Simple Present)
8. They do detention. (Present Perfect)
9. Uncle John can't fix the bike. (Simple Present)
9. Uncle John to fix the bike. (Present Perfect)
10. He may not have a party. (Simple Present)
10. He have a party. (Present Perfect)