1. They ______________ go there. They're too tired.
won't be able to
2. Last week we could go swimming, this week we ______________ .
can't
3. I _______ speak to him on the phone for three weeks last month.
couldn't
4. I _______ make a cake if I have all the ingredients.
will be able to
5. When my brother was younger, he ______ stay up late without getting sleepy, but now he always goes to bed early.
could
6. He ______________ drive if he is ill.
won't be able to
7. Do you think we ______________ park over here?
can
8. He ______________ do that exercise, it is too difficult.
won't be able to
9. ______________ you understand what he said?
Could
10. Look at that sign! You ______________ walk on the grass.
can't
