Question

Fill in the with the appropriate form of the verb in brackets:
I won’t disturb you if you … when I arrive. (work)

I’ll lend you the video if you … it. (not see)

He will be in a bad mood when we arrive if he … for long. (wait)

They’ll get lost unless they … there before. (be)​

Answer 1

I won't disturb you if you **are working** when I arrive.

I'll lend you the video if you **haven't seen** it.

He will be in a bad mood when we arrive if he **has been waiting** for long.

They'll get lost unless they **have been there** before.