……是必要的 It is necessary （for sb） to do / that …
…… 是重要的 It is important/essential （for sb） to do / that …
…… 是适当的 It is proper （for sb） to do / that …
……是紧急的 It is urgent （for sb） to do / that …
例：
It is necessary that you finish your work on time.
你必须准时完成工作。
To understand why they are doing it, it is necessary to know wherethey are coming from
要弄清楚他们这样做的原因，必须要了解他们的意图。
《柯林斯高阶英汉双解学习词典》
Circumstances changed, it is necessary for you to make a new plan.
情况变了，你有必要制定一个新计划。
It is important to understand the powerful economic and social forces at work behind our own actions.
重要的是，要理解在我们自身行动背后起作用的强大的经济和社会力量。
《柯林斯高阶英汉双解学习词典》
It is important to think about how these institutions might bereconstructed in our own societies.
重要的是，要想想在我们自己的社会里如何对这些机构进行改造。
It is important to check when the laboratory can do the tests.
核实一下实验室何时可以进行这些测试是很重要的
It is important for us to meet personally although we have been in touch in various ways.
尽管我们以多种方式保持联系，见面对我们来说还是非常重要的。
I think it is important for children to have brothers and sisters theycan relate to
我认为对孩子们来讲有可以相互理解沟通的兄弟姐妹很重要。
It is important to remember that each person reacts differently
重要的是要记住每个人的反应不同。
It is important, I think, for everyone to be careful about claimingvictory.
我想，每个人宣布胜利时都应该慎重。
It is important that we dovetail our respective interests
让我们各自的利益相吻合很重要。
It is important that we put Jesus into the context of history.
我们将耶稣置于历史环境中来看是很重要的。
It is important to know where to place the stresses.
知道什么地方重读是重要的。
It is important for the state's future administrators to get out of the rarefied air of the capital.
对国家日后的统治者来说，摆脱首都过于清高的氛围是很重要的。
It is important never to overdo new exercises
重要的是，不要过度练习新学的动作。
It is important that food be breaded just minutes before frying.
把食物抹上面包屑后过几分钟就炸，这一点很重要。
It is important that an adolescent boy should have an adult in whom he can confide
关键是，青春期的男孩身边应该有一个可以交心的成年人。
It is important to be clear about what Chomsky is doing here
很有必要搞清乔姆斯基在这儿干什么。
If the symptoms persist, it is important to go to your doctor.
如果这些症状持续存在，一定要去看医生。
It is important to get something down on paper
把一些东西写在纸上很重要。
It is important for a manager to be able to get the support of his peergroup.
对于经理而言，得到同级同事的支持很重要。
In business, it is important to network with as many people aspossible on a face to face basis.
在生意场上，通过与尽可能多的人面对面地打交道来建立工作关系很重要。
It is important to recognize jealousy and to nip it in the bud before it gets out of hand.
重要的是要甄辨出嫉妒情绪并尽早消除这种心理，以免其一发不可收拾。
《柯林斯高阶英汉双解学习词典》
essential完全必要的; 必不可少的; 极其重要的; 本质的; 基本的
It is essential that we tackle this thorny problem.
我们很有必要处理这个棘手问题。
It is essential that you are able to read a thermometer.
最基本的是要能看懂温度计。
If you are prosecuted by the police, then it is essential that you takespecialist legal advice.
如果你受到警方起诉，至关重要的是你要听取专业律师的意见。
《柯林斯高阶英汉双解学习词典》
It is essential that your diet is varied and balanced
关键是你的饮食要多样化，并保持均衡。
It is essential for all players who wish to compete that they earncomputer ranking points.
对所有希望参赛的选手来说，获得电脑排名的分数非常重要。
《柯林斯高阶英汉双解学习词典》
It is essential to feel at ease with your therapist
在治疗师面前放松下来是很重要的。
《柯林斯高阶英汉双解学习词典》
We don't think it is proper to transport the goods by railway.
我们觉得此货不适适用铁路运输。
It is proper to be skeptical of radical new ideas.
对激进的新想法持怀疑态度并不为过。
It is proper that we ( should) keep the public places clean.
我们应当坚持公共场所干净。
It is proper to learn even from an enemy.
向敌人学，也无不可。
It is proper to adopt real estate invest trust way in SPV at first.
在初步阶段，先采用不动产投资信托方式来试行证券化，随着环境的成熟，到最终的阶段，则可以通过SPV来实现住宅抵押贷款证券化。
In this scenario, it is proper for the server to send a Trying responsewith a response code of100.
在此场景中，服务器可以发送响应代码为100的Trying响应。
It is proper for us to keep the public places clean. 我们应该保持公共场所的清洁。
It is proper that we （should） keep the public places clean.
我们应该保持公共场所的清洁是恰当的。
It is urgent that government and experts take measures to solvethese problems.
迫切需要政府和专家采取措施解决这些问题。
It is urgent that I should have this money without delay.
我急于要这笔钱，不能拖迟。
It is urgent to develop urban family social work in China.
中国现阶段迫切需要发展城市家庭社会工作。
It is urgent that food and clothing be sent to the sufferers.
急需将食物和衣服送给灾民。
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