そうではないと思います
そう思わない。
I don't think that that's the case.
そうは思わないけど。
to regard something as too good for oneself
I don't think that is the case for that.
I don't think that at all.
I don't think that's an exaggeration.
I am sure that there is nothing like that.
I don't think we should do that.