have trouble in doing可不可以是have troubles in doing还有have difficulty in doing和have difficulties in doing呢?这四个的in都可以省略吗?

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have trouble in doing可不可以是have troubles in doing还有have difficulty in doing和have difficulties in doing呢?这四个的in都可以省略吗?
have trouble in doing
可不可以是have troubles in doing还有have difficulty in doing和have difficulties in doing呢?这四个的in都可以省略吗?

have trouble in doing可不可以是have troubles in doing还有have difficulty in doing和have difficulties in doing呢?这四个的in都可以省略吗?
介词都可以省,但是trouble是不可数名词只能用单数,我们可以说have some trouble in doing something;也可以说have some difficulties in doing something