Task 3. Fill in the gaps with can, can’t, could, couldn’t, will be able to or won’t be able to.
1. They ____can't___go there. They’re too tired.
2. Last week we could go swimming, this week we _____can't______ .
3. I ____couldn't_____ speak to him on the phone for three weeks last month.
4. I____will be able to_____ make a cake if I have all the ingredients.
5. When my brother was younger, he ____could_____ stay up late without getting sleepy, but now he always goes to bed early.
6. He____won't be able to_____ drive if he is ill.
7. Do you think we ____can______ park over here?
8. He___can't_____ do that exercise, it is too difficult.
9 ______Can_____ you understand what he said?
10. Look at that sign! You _____can't_____ walk on the grass.