当动词think, believe, suppose, expect, imagine 后接一个表示否定意义的宾语从句时，其否定通常转移到主语：

I didn't think you liked sports.

我原以为你不喜好运动。

I don't believe Lotte and I will ever be parted

我相信洛特和我永远都不会分开。

《柯林斯高阶英汉双解学习词典》

I don’t expect that he has done such a thing. 我预料他不会干出这种事来。

I don't suppose that it is true. 我认为那不是真的。

I don't imagine that he will come. 我想他不会来的。

I don't think we need waste much time on it. 我想我们不必在这上面花太多时间

We didn't think we'd be this late. 我们没想到我们会到得这么晚。

I don't suppose I'll trouble you again. 我想我不要再麻烦你了。