help sb to do = help sb do,两者均可，I often help him clean the classroom。或I often help him to clean the classroom
help sb to do sth = help sb do sth= help sb with sth： 帮助某人干某事 （这三个都可以，意思也一样）
clean help sb. do sth.
都是可以的,一般都用help sb do
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