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1·I'm suspicious of his motives.

我怀疑他的动机。《牛津词典》

2·Their motives remain a mystery.

他们的动机仍然是个谜。《牛津词典》

3·I fully understand your motives.

我完全理解你的动机。《牛津词典》

4·I was suspicious of his motives.

我怀疑他的动机。《牛津词典》

5·His motives were pure.

他动机纯正。《牛津词典》

6·Her motives for helping are questionable.

她帮忙的动机令人生疑。《牛津词典》

7·The Secretary's letter impugns my motives.

该部长的来函质疑我的动机。《柯林斯英汉双解大词典》

8·I suspected her motives in offering to help.

她主动要帮忙，我怀疑她的动机。《牛津词典》

9·The incident cast doubt on her motives and reliability.

这件事使人怀疑她有何动机，以及她是否可靠。《牛津词典》

10·People want to dissect his work and question his motives.

人们想剖析他的作品，质疑他的动机。《柯林斯英汉双解大词典》

(1)motive force动力；起动力，原动力

(1)motive power动力

(1)ulterior motive隐秘不明的动机

(1)profit motive利润动机