您好,
如果是使用 trouble这一词, 那麼不加s:
Have trouble doing them 或 Have trouble doing it.
如果是使用 problem 那麼 problem 或 problems 皆可.
至於中间的difficult, 应该是用 difficulty 一词, 也就是 Have difficulty doing 而不是...
Have trouble doing和Have difficult doing和Have problem diong
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