用作形容词 (adj.)
用作定语
~+ n.
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My money came short of the necessary sum.
我的钱不足所需的数目。
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Do you have the necessary skills for this job?
你具备做这项工作所必需的技能吗?
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They joined the wires and made the necessary new connection.
他们把电线接了起来,接通了所需的新线路。
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I'll leave it to you make the necessary arrangements.
我将让你作出必要的安排。
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The lawyers will draw up all the necessary papers.
律师们将拟定出所有必要的文件。
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No one foresees how the necessary restriction of the population will be effected.
任何人都无法预知将如何实现对人口的必要限制。
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They will meet in Beijing to debate taking necessary actions against environmental pollution.
他们将在北京会晤并讨论采取必要措施防止环境污染。
用作表语
S+be+~
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A year's guarantee on the television set for all repairs might be necessary.
必须为电视机提供为期一年免费修理的保单。
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A climber must learn to discriminate as to when compass bearings are necessary and when they are not.
一个登山者必须学会辨别什么时候需要罗盘测定方位,什么时候不需要。
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Under certain conditions, answering back sarcastically is necessary.
在某种情况下,反唇相讥是必要的。
S+be+~+ prep .-phrase
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Patience and understanding are necessary for a teacher of infants.
耐心和理解是幼儿教师必不可少的。
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What is necessary for one person is not always necessary for another.
对某人来说是必需的东西,对别人则未必如此。
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These reference books are necessary to scientists.
这些参考书是科学工作者所必需的。
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Sleep is necessary to one's health.
睡眠对健康是必要的。
It is/was+~+(for sb) to- v
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It was necessary to jump on the ice coated mounds of brush several times before they could flush.
你得在这些被冰覆盖的树丛上跳上好几下,才能把它们惊起。
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It's necessary to raise wages on the basis of increasing production.
需要在增加生产的基础上增加工资。
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Because the company was doing more business, it was necessary to expand the factory.
由于公司业务的扩大,扩大工厂是必然的。
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It was necessary to retire several generals who lacked energy and enterprise.
使几位缺乏精力和上进心的将军解职是必要的。
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It is sometimes necessary to indulge a sick child.
迁就一个生病的小孩有时是必要的。
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It is both important and necessary to note this difference.
注意到这个差别是重要的和必要的。
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Is it really necessary for me to attend the meeting?
我真的必须出席会议吗?
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It's necessary for us to net the currant bushes.
我们有必要用网盖上红醋栗树。
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It is necessary for them to decide on which type of fuel is most suitable.
他们必须决定哪一种燃料最合适。
It is/was+~+that-clause
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It is necessary that everyone be there in time.
大家都按时到达那里是必要的。
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It's necessary that young and old people should communicate more with each other.
年轻人和老年人有必要保持更多的联系。
用作宾语补足语
S+V+O+~
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We consider it necessary that the machine should be oiled regularly.
我们认为机器必须定期加油。
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This has made it necessary for agriculture and industry to develop very quickly.
这就使得工农业必须飞速发展。
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I felt it necessary to speak about our shortcomings.
我觉得有必要谈谈我们的缺点。
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Some students hold it necessary to be able to speak English.
有些学生认为能讲英语是非常必要的。
其他
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The National People's Congress holds one session each year. When necessary, the session may be advanced or postponed.
全国人民代表大会每年召开一次会议,必要时,会期可以提前或推迟。
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If necessary, the heavy machinery can be brought into action.
若有必要,可以使用重型机械。
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If necessary,I'll go there again.
如有必要,我会再去那里的。