我弄不明白他为什么这么做。

I can't ___figure ___out why he did it.

我觉得他真的很奇怪——我完全无法理解他。

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

我搞不清楚发生了什么。

I couldn't ___figure ___out what had happened.