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【复习】
Last time we learned a sentence pattern which is:It is essential that S should do. 意思是：完全有必要做某事。当主句的表语为形容词essential, necessary等表示“必要的”这类词语时，主语从句中则要使用虚拟语气，即：谓语形式为：should+动词原形。我们还引申出了一个句型是：It is essential to somebody ( something ) that S should do. 以上2个句式中的should都可以省略。
【习题答案及点评】
And some translation exercises were left last time that need you to translate it into English in different ways, which is a bit difficult and I am about let the answers and comments to them out in the open.
【Exercise I】我们将这两组分开是完全有必要的。
【Translation 1】It is essential for us to keep these two groups separate.
【Translation 2】It is essential that we (should) keep these two groups separate.
【Translation 3】It is essential to us that these two groups ( should ) be kept separate.
【喇叭】
1 翻译3中注意省略了should后，谓语则是be。
2 翻译1和翻译2中的状语意思都是“对于我们来说”，都是介词短语作状语，那么在使用主语从句翻译时介词要用to, 而在使用动词不定式翻译时介词要用for.
【点评】
1 短语的使用：keep something separate 使......分开，这个短语中separate 是形容词做keep后面的宾语something的补足语。
2 翻译方式： 第一句是使用动词不定式翻译。第二句和第三句都是使用主语从句进行翻译，不同的是第一句中的的主语从句是主动语态，而第二句中的主语从句是被动语态。
【Exercise II】我们生活中诸如水，电，燃气等设施是必不可少的。
【Translation 1】It is essential for us to be provided with services such as: water , electricity, gas in our life.
【Translation 2】It is essential to our life that we ( should ) be provided with services such as : water , electricity, gas .
【Translation 3】It is essential to us that services such as :water , electricity, gas ( should ) be provided with in our life.
【Translation 4】It is essential to our life that some relevant departments( should ) provide us with services such as : water , electricity, gas .
【点评】
1短语的运用：provide somebody with something这个短语译为：提供某人某物，给某人某物，and so on. relevant departments意思是“相关部门”。
2 翻译方式： 翻译1是使用动词不定式进行翻译。翻译2、3、4都是采用含主语从句的复合句进行翻译，不同的是翻译4是在主语从句中使用了主动语态进行翻译，翻译2和翻译3的翻译方式都是在主语从句中采用被动语态，由于在翻译中采用了provide somebody with something这个动词后有一个宾语以及介词有一个宾语的短语，那么这2个作为宾语的名词在被动语态中都可以作为主语，关键要强调一点的是把介词后的名词作为主语时，那么with要保留，很多人会忽视了这个介词。还要强调一点当在被动语态中省略了should时，注意保持be这个原形。
