Question

Напишите следующие предложения в отрицательной форме
I can swim.
They had to work in the evening
I could see them after work.
They had to be back early
There barrels must empty

Answer 1

I can not swim.
They did not have to work in the evening.
I could not see them after work.
The did not have to be back early.
The barrels must not be empty.