I really can't think of doing it.我真的没想到会做到

think of:想到；考虑

What do you think of modern art?

你对现代艺术有何看法？

I couldn't think of the name of that man anyhow.

我怎么也想不出那人的名字来了。

think of，think about，think over这三个词组都与“想”有关，但所表达的含义有所不同。

think of多用来指“想起，认为”。

think about多用来指“考虑某事情或对某事进行思考”。

think over意思是“仔细考虑，认真思考”。

It took me a long time to stop it all together.一下子戒掉他们花了我很长时间

it take sb sometime to do sth:某人花费一些时间做某事

How long will it take me to get there?

到那儿要花多长时间？

It took me quite a while to fill out the questionnaire.

填写那份问卷花了我好长一段时间。