motive是可数名词：n.动机;原因;目的adj.发动的;导致运动的复数： motives；1、Im suspicious of his motives. 我怀疑他的动机。2、I was suspicious of his motives. 我怀疑他的动机。3、His motives are unclear. 他的用意不明。

相关介绍：

She distrusted his motives for wanting to see her again.

她怀疑他想再见她一面是别有用心。

He acted from base motives.

他的行为动机卑鄙。

He tried to get a fix on the young man's motives, but he just couldn't understand him.

他努力了解这个年轻人的动机，但就是弄不清楚。

Their motives remain a mystery.

他们的`动机仍然是个谜。

Her motives for helping are questionable.

她帮忙的动机令人生疑。