用作形容词 (adj.)
用作定语
~+ n.
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She's a useful person to know.
她是个应该结交的有用的人。
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John is a useful person to be around on such occasions.
在这种场合有约翰在身边是很有帮助的。
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Horses are useful animals.
马是有用的动物。
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I need a useful dictionary.
我需要一本有用的词典。
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He gave us some useful advice.
他给了我们一些有益的忠告。
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Salt is a useful substance.
盐是一种有用的物质。
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This is a useful book for beginners in English.
这是一本对英语初学者有用的书。
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The England cricket team scored quite a useful total.
英格兰板球队得分总数令人满意。
用作表语
S+be+~
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Money is always useful.
钱总是有用的。
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Information about people's language ability is often very useful.
有关人们语言能力的信息经常是很有用的。
S+be+~+ prep .-phrase
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He is useful at cooking.
他很会烧菜。
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He is very useful at maths.
他精通数学。
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These books might be useful to you.
这些书可能会对你有用。
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These story books are useful to children.
这些故事书对儿童有好处。
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Your advice was very useful to me.
你的劝告对我很有益处。
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We should absorb whatever experience is useful to us.
我们应吸取对我们有益的经验。
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Tom's advice has been most useful to us.
汤姆的建议对我们是很有用的。
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Such information is useful only to those who know that particular subject.
这种材料只是对了解那个特殊问题的人才有用。
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Outdoor sports are useful to your health.
户外运动对你的健康很有好处。
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This book will come in useful for criticizing the wrong behaviour.
这本书对批评错误的行为很有用。
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The computer is useful in processing data.
计算机在处理数据方面很有用。
It is/was+~+(for sb+) to- v
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It is useful to read the text early in the morning.
清晨读课文很有用。
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It is very useful for a person to know how to swim.
对一个人来说会游泳是很有用的。
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Probably it will be useful for them to acquire a practical knowledge of English.
有英语的实际知识可能对他们有用。
It is/was+~+ v -ing
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It's useful knowing several foreign languages when you are traveling abroad.
在国外旅行时,会几门外语是非常有用的。
用作宾语补足语
S+V+O+~
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I find this pen very useful.
我觉得这支笔很有用。