用作形容词 (adj.)
用作定语
~+ n.
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She is a helpful girl.
她是位乐于助人的姑娘。
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The teacher gave us a lot of helpful books in maths.
老师给了我们许多数学上有帮助的书。
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It was a helpful thing to do.
这样做是有益的。
用作表语
S+be+~
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You've been very helpful.
你帮了很多忙。
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She is intelligent, outgoing and helpful.
她聪明、开朗、乐于助人。
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The book is really helpful, don't you think?
这本书真的很有用,不是吗?
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I always think criticism is helpful.
我总认为批评是有益的。
S+be+~+ prep .-phrase
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He is always very helpful to his mother.
他对他母亲总是很有帮助。
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This dictionary is very helpful to your English study.
这部词典对你学习英语很有帮助。
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It's helpful to us.
这对我们有利。
It is/was+~+for〔of〕 sb+to- v
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Don't throw it, it is helpful for us to repair the bike.
别扔了它,它对我们修自行车有帮助。
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It was helpful of you to do that.
你那样做真是助人为乐之举。
用作宾语补足语
S+V+O+~
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You may find this book helpful.
你会觉得这本书很有用的。