做某事有问题problem后面加不加s?如果换成trouble或difficulty呢?

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做某事有问题problem后面加不加s?如果换成trouble或difficulty呢?
做某事有问题problem后面加不加s?如果换成trouble或difficulty呢?

做某事有问题problem后面加不加s?如果换成trouble或difficulty呢?
这三个字加不加S要看你指单数还是复数.另外,有一两个习惯用法是只用单数的:如got in trouble with the police.
I've had troubles ever since I took this job.
A cause or source of distress,disturbance,or difficulty:The new recruits were a trouble to him.
这种情况不不用复数.

have a problem to do sth
have problems to do sth

看你前面修饰problem的是单还是双,have problem to do sth or have some problems to do sth trouble和difficulty一样。