做某事有困难have difficulty in doing还是difficultieshave problem in doing 还是 problems

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做某事有困难
have difficulty in doing还是difficulties
have problem in doing 还是 problems

都是单数
have difficulty in doing;
have problem in doing

have trouble in doing sth
have difficulty in doing sth
这两个都可以

have difficulty in doing sth

绝对是单数那种,相信我没错的。
have difficulty in doing
have problem in doing

应该用单数形式。
因为这里的difficulty和problem是抽象的不可计数的,并不是具体多少,在词组应用中应该用单数形式。

单数形式~我英语6级~相信我~

单数