An idea just occurred to me. [=I just had an idea]我恰好想到一个主意。

It suddenly occurred to me that there was a simpler way to deal with the problem.我忽然想到一个更简单的方法来处理这个问题。

Did it ever occur to you [=did you ever think] that maybe you were wrong?你可曾想到也许是你错了吗？

It never occurred to me to ask. [=I never thought of asking]我从来就没想到问一下。