sometime表示百分之几

sometimes表示百分之三十。

She comes to visit us sometimes.    她有时来访问我们。

I sometimes think that it is a great mistake.    我有时想这是一个大错。

It is sometimes warm and sometimescold.    天时热时冷。

Sometimes I will go to the university for the elderly.

有时我会去上老年大学。