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Have difficulties in writing，不是我写作能力有问题，而是由于其他各种鸡毛蒜皮的原因，导致我没有办法去写作。 详细解释： 'Having difficulties doing' means that you are having trouble …
No, you cannot say 'have difficulty to do something'. 'have difficulty (in) doing something' will do instead. I've just checked the oxford dictionary again. You are right.
If you look up the usage of the noun "difficulty" in any dictionary, you will find that you say "difficulty doing something or difficulty in doing something", without any difference in …
I have difficulty doing the thing. Having difficulty may have more 'proper' connotation, and might sound more formal. I have a hard time doing the thing. Having a hard time …
更多内容请点击：have difficulty ，have difficulties doing哪个正确为什么？ - 知乎