句型例句
用作定语
▲ ～+n.
She is a helpful girl. 她是位乐于助人的姑娘。 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。 It was a helpful thing to do. 这样做是有益的。用作表语
▲ S+be+～
You've been very helpful. 你帮了很多忙。 She is intelligent, outgoing and helpful. 她聪明、开朗、乐于助人。 The book is really helpful, don't you think? 这本书真的很有用，不是吗? I always think criticism is helpful. 我总认为批评是有益的。▲ S+be+～+prep.-phrase
He is always very helpful to his mother. 他对他母亲总是很有帮助。 This dictionary is very helpful to your English study. 这部词典对你学习英语很有帮助。 It's helpful to us. 这对我们有利。▲ It is/was+～+for〔of〕 sb+to-v
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。 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+～
You may find this book helpful. 你会觉得这本书很有用的。