​Supply the correct verb tense, paying careful attention to the tense sequence: I'll pay you double if you (get) the work finished by Friday

Supply the correct verb tense, paying careful attention to the tense sequence:
I'll pay you double if you (get)______ the work finished by Friday.
We'll have the party in the garden if the weather (be)______ good. If not it'll have to be inside.
If anyone (ring)_____ for me, please tell them I'll be ack in the office at 4 o'clock.
4. If she hadn't called. I (not know)________.
I wouldn't work for them (even) _______ if they (pay) _______ me twice my current salary.