john is often seen (help) the old man with his housework
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johnisoftenseen(help)theoldmanwithhishouseworkjohnisoftenseen(help)theoldmanwithhishouseworkjohnisof
john is often seen (help) the old man with his housework
john is often seen (help) the old man with his housework
john is often seen (help) the old man with his housework
答案:to help
1.此句为被动语态,还原成主动句为:
Sombody often sees John ____ the old man with his housework.
此句含有“感官动词see + 宾语John + 宾语补足语”结构,且宾语补足语为help的非谓语形式.
2.很明显,宾语John和宾补动词help之间为主动关系,且句意强调该动作经常发生(often),所以宾语补足语只能使用不带to的不定式(即动词原形)help,而不能使用现在分词helping.
3.但是该句变为被动后,根据语法规定,应该补回不定式符合to,所以题目的正确答案为:to help.
如果你满意我的答案,敬请点击 ,
helping
其实这个题考查的不是时态问题 ,而是一个感官动词的用法而已,
see...sb do sth see sb doing sth 这个两个短语的区别而已,只是我把它换成 被动语态才出现is而已。 那么这里应该用 helping, 以为to do 含有一点还没有做的意思。
没错,支持楼上意见,是helping
因为前面有be动词(is),后面必须接 动词的 现在分词(就是ing形式)
你都不用往后看
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