Hi,

I would like to ask 2 questions.
1) Can we omit 'that' when using this style?

I will fix your car on condition you wash mine.

2) When you are talking about the future, we do not use will after unless/as long as/ provided/ providing/ so long as/ whereas. (In the main clause)

Can we include 'on condition that and suppose/supposing that' also?

On condition that I will..........
Suppose that I will............

Thanks....