tổng hợp thì exercise 1

Columbus................................ America more than 400 years ago.

• discovered

• has discovered

• had discovered

• he has gone

He fell down when he………. towards the church.

• run

• runs

• was running

• had run

We ..................................there when our father died.

• still lived

• lived still

• was still living

• were still

  living

I ..............................in the room now.

• am being

• was being

• have been being

• am

I .................................. to New York three times this year.

• have been

• was

• were

• had been

I will come and see you before I........................... for America.

• leave

• will leave

• have left

• shall leave

John ........................ a book when I saw him.

• is reading

• read

• was reading

• reading

He said he ........................return later

• will

• would

• can

• would be

Jack........................the door.

• has just opened

• open

• will have opened

• opening

We ..........................Doris since last Sunday

• don’t see

• haven’t seen

• didn’t see

• hadn’t seen