4. I(believe) it when I (see) it.
5. You (be) able to drive after you (have) another five lessons.
6.Unless, he (run),he (not catch) the train.
7. He (lend) it to you if you ask him.
8.If petrol pump attendants (go) on strike we (not have) any petrol.
9. He (be) offended if you (not invete) him.
10.She (have) 6000$ a year when she be twenty.