Fill in the blanks with an infinitive with or without to.
1. They didn't allow me ................................ the hall.
Allow is followed by an infinitive with to.
2. She didn't let me .................................. her room.
Let is followed by an infinitive without to.
3. You ought ..................................... a doctor.
Ought is followed by a to-infinitive.
4. He is able ..................................... on his hands.
Able is followed by a to-infinitive.
5. She can ................................... with both hands.
Can is followed by an infinitive without to.
6. They made us ................................. for hours.
Wait is followed by an infinitive without to.
7. I forgot ..................................... the letters.
Forget is followed by an infinitive with to.
8. I saw him .................................. the road.
See is followed by an infinitive without to.
9. I heard her ................................... on the phone.
Hear is followed by an infinitive without to.
10. You needn't ................................... for me.
When need is a modal auxiliary, it is followed by an infinitive without to.
11. You don't need .................................... for that call.
When need is an ordinary verb, it is followed by an infinitive with to.
12. He refused ................................ to me.
Answers
1. They didn’t allow me to enter the hall.
2. She didn’t let me enter her room.
3. You ought to consult a doctor.
4. He is able to walk on his hands.
5. She can write with both hands.
6. They made us wait for hours.
7. I forgot to post the letters.
8. I saw him cross the road.
9. I heard her talk on the phone.
10. You needn’t wait for me.
11. You don’t need to pay for that call.
12. He refused to talk to me.
