have no problems (in) doing sth.中的problem永远都加s吗?

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have no problems (in) doing sth.中的problem永远都加s吗?
have no problems (in) doing sth.中的problem永远都加s吗?

have no problems (in) doing sth.中的problem永远都加s吗?
problem不永远都加s
have a problem (in) doing sth

通常不加’s'.
I have no problem in doing this job.