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help to do sth 还是help do sth would like not to do sth对不对 be confident to do sth对不对 use sth to do 还是doing help do sth和help to do sth区别 have ability to do sth用不用加the be used to do sth什么意思 help to do sth是什么结构 

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be useful to do something be useful to sb be useful to的用法 be useful to somebody be useful to等于什么 be+useful+to和for be useful for doing sth be useful doing be useful in doing sth sth be useful to sb 

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