think 有虚拟语气吗?

Yes..

for example

Do you really think that I am going to let you go out today?

and

Is that correct? Oh! what do you think? Surely you are smart enough to think!!! - said with a sarcastic tone..

add the tone in then yes...there's a negative way of using think...

可以有虚拟语气，但不是必然。如果表示对某件事的猜测可以虚拟
如I think they would win the game.
这里就是对未来的一种虚拟

补充：
何以见得是委婉而不是虚拟？不是用了would就都是委婉，对将来的虚拟就要用would,如果说现在还用would那才叫委婉
对过去和现在的虚拟确实是与事实相反，但是将来不是，是对不确定性的猜测。将来的事情还没有发生，你怎么知道一定相反？
如果你认为不对就算了，不必出言不逊，有失风度

同意楼上两位专家的答案。。

would/should think 如果是用在现在时态就是委婉。用在将来时态就是虚拟了。

我觉得用wish来表示虚拟语气比would think更好一些