TENSES AND RELATED EXERCISES

When I________for my sister in front of the supermarket, a strange man came to talk with me.

• was waiting

• waited

• had waited

• were waiting

By the time the software________on sale next month, the company will have spent $2 million on developing it.

• went

• will go

• has gone

• goes

What________at 9 o’clock last night? I phoned you but couldn’t get through to you.

• did you do

• were you doing

• would you do

• had you done

For the last 20 years, we________significant changes in the world of science and technology.

• witness

• have witnessed

• witnessed

• are witnessing

I haven’t met him again since we________school ten years ago.

• have left

• left

• leave

• had left

His health ________ a lot since he started doing exercises regularly.

• has improved

• improved

• improves

• is improving

Find the mistake in the sentence below

By the time we reach Da Nang, we drove for twelve hours.

• hours

• drove

• reach

• by the time

Eight years ago, we started writing to each other.

• We have rarely written to each other for eight years.

• Eight years is a long time for us to write to each other.

• We have been writing to each other for eight years.

• We wrote to each other eight year ago.

By the year 2025, 6% of all US jobs ___________ by robots, report says.

• will eliminate

• will have been eliminated

• will be eliminating

• will have eliminated

Mary will have finished all her work _______.

• as soon as her boss returned

• until her boss will return

• by the time her boss returns

• when her boss will return