在学校的英语Essay中，如果能用上比较复杂的句型，能够使文章看起来更加专业。如果是在essay的写作考试里，能写出复杂的句子，更可以增加自己的语法分数。所以，学习使用各种句型，尤其是复杂和少见的句式，是非常有必要的。在这篇文章中，小编要教大家几种高分句式的写法。学会了这些高分句式之后，还要多造句，这样才能熟练并正确地使用。
Only when…引导的倒装句
这种句式在essay考试中很好用，尤其当你要强调“只有在什么样的情况下，会怎么样”的时候。比如，当你想说“只有政府说服群众某个项目有钱赚，才能吸引到更多投资”，就可以用上only when的句式：Only when the government convinces them that this project is profitable will it be able to lure their dollars。
那么，怎么样才能会写这样一个倒装句呢?其实也很简单。我们先从简单的when引导的句子说起。比如说刚才那个句子，我们把only去掉还原成when的句式，就变成：When the government convinces them that this project is profitable,it will be able to lure their dollars。然后，我们稍微对比以下这两个句子，就不难发现，这个only when的倒装句，只是在when这个句子上做了个小小的改动——把逗号去掉，把can提前。
这里有一个when引导的句子，同学们可以尝试把它们改成only when的倒装句：
When different groups are convinced that their legitimate objectives can be achieved through a political process,violence in this country will substantially abate.
调整后：
Only when different groups are convinced that their legitimate objectives can be achieved through a political process will violence in this country substantially abate.
It is when…that…句式
如果在essay的写作考试中使用这个句式，也可以使句子看起来非常高级。这种句式所表达的意思跟only when的倒装句差不多，都是强调“只有当…的时候，会怎么样”。下面，我们就来学习这种句式的写法。
我们还是从when引导的相对容易的句子来学起，比如我们刚才看过的这句话：When the government convinces them that this project is profitable,it will be able to lure their dollars.想把它转换成it is when…that…的句式也很容易——只需要在when前加个it is only，再把逗号换成that就可以了：it is only when the government convinces them that this project is profitable that it will be able to lure their dollars.
前面我们看过的另外一个例句“When different groups are convinced that their legitimate objectives can be achieved through a political process,violence in this country will substantially abate.”就可以改成：It is only when different groups are convinced that their legitimate objectives can be achieved through a political process that violence in this country will substantially abate.
Only by doing引导的倒装句
除了我们前面看过的only when…，还有一种only by doing引导的倒装句也十分好用。比如说，当你在essay写作中想形容只有做某事才能怎样的时候，就可以用上这个句式。下面，我们就来学学这种句式的写法。
我们从一个简单的by doing的句子来看起：Despite some potential risks,vaccinating against spreadable diseases is entirely necessary,as by doing so,we can protect children from those illnesses。要把这句话的后半部分改成only by的形式，我们只需要在by的前面加个only，再把后面的逗号去掉，再把can提前就可以了。改为之后就变成：Despite some potential risks,vaccinating against spreadable diseases is entirely necessary,as only by doing so can we protect children from those illnesses。
It is only by…that…句式
今天要教给大家的最后一个高级句式是It is only by…that…。这个在考试中也很容易拿高分，同时也很好学。我们还是从上面那个简单的例句看起：Despite some potential risks,vaccinating against spreadable diseases is entirely necessary,as by doing so,we can protect children from those illnesses。要把它改成It is only by…that…的更高级的句子，我们只需要在by前面加个it is only，再把逗号去掉改成that就可以了。改好的句子就变成：Despite some potential risks,vaccinating against spreadable diseases is entirely necessary,as it is only by doing so that we can protect children from those illnesses。
以上就是英语论文Essay中常用高级句型的介绍。多使用这些句型能在最大程度上帮助同学改善Essay的表达效果。
原文：https://www.cnblogs.com/MeelounEssay/p/14636249.html