我搞不懂他为什么这么做。

I can't ___figure ___out why he did it.

我觉得他真的很奇怪——我完全搞不懂他。

I find him really odd - I can't ___figure him ___out at all.

我弄不明白发生了什么。

I couldn't ___figure ___out what had happened.