表示不同意:
I am afraid I can't....
I disagree...
No way.
By no means.
Of course not.

表示条件或假设：
if ...
so long as...
provided...
unless..

表示比较关系：
as...as...
would rather ...than....
prefer...to...
Just as ..., so....
The more..., the more...
Second to...

表示因果关系：
because...
since...
now than...
so...that...
give rise to...
result in...
be attributed to..
due to...
thanks to
result from
on account of
owing to

表示让步或转折关系的结构：
though...
although...
even if...
but...
unless...
instead
despite
even...
等等。