l) if 如果，假如：
lt doesn't matter if you can't find her.
If you do it, so can I.
2) even if 即使：
They'll stand by you even if you don't succeed.
We wouldn't lose heart even if we should fail ten times .
3) unless 除非(……否则)，如果不：
Don't Come unles I telephone.
You won't catch the bus unless you run.
4) incase 如果，以防：
Incase I forget, please remind me about it.
We'd better take our raincoats in case it should rain.
5) provided (that)要是，只要：
I'll come provided (that) you let me know in good time.
They may swim provided an adult accompanies them.
6) suppose (supposing)假定，要是：
Suppose (Supposing) (that) he won't agree, what shall we do?
Supposing the Plane is late?
7) as Iong as 只要：
I am happy as long as you are happy.
As long as you understand, we shall say no more about it.
8) on condition that 只要，条件是：
I'll come on condition that John is invited, too.
You may borrow the book, on condition that you do not lend it to anyone else.