在托福写作中强调是一种修辞效果，是为了对一定语境下的部分内容进行突出强调而采取的一种手段。运用这种强调句型可以强调句子的主语、状语、宾语以及从句(主语从句，状语从句，宾语从句)等，一般不能用来强调谓语动词。
英语中的强调句式结构为It is ...that...，也就是：It is/was + 被强调部分+that+剩余部分。
01对主语进行强调
例句：
Their sensitive response to human circumstance accounts for the persistence of certain collective ideas.
他们对人类环境的敏感反应，才保证了一些共同观点的持续性。
强调主语：
It is their sensitive response to human circumstance that accounts for the persistence of certain collective ideas.
02对状语进行强调
1对地点状语的强调
例句：
For physicists, this new development makes any appreciable difference in the explanation of observations only in the world of atoms.
只是在原子世界中，这一新发展才会在对各种观察做出解释时产生相当的差异。
强调地点状语：
For physicists, it is only in the world of atoms that this new development makes any appreciable difference in the explanation of observations.
2对时间状语的强调
例句：
Women sculptors have been recognized as elite artists only during the twentieth century.
二十世纪，女艺术家才被承认为精英艺术家。
强调时间状语：It has been only during the twentieth century that women sculptors have been recognized as elite artists.
3对原因状语进行强调
例句：
He was elected as one colonel because of his eligibility in many aspects.
他被选为陆军上校是因为在很多方面都具备能力。
强调时间状语：
It is because of his eligibility in many aspects that he was elected as one colonel.
4对方式状语进行强调
例句：
By way of the emphasis on oral comic literary creativity，these Chicano writers developed the powerful and arresting language.
通过对口头喜剧文学创造性的强调，这些奇卡诺作家才得以发展一种强有力的和富于吸引力的语言。
强调方式状语：
It has been by way of the emphasis on oral comic literary creativity that these Chicano writers developed the powerful and arresting language.
03对宾语进行强调
例句：
One attributes the name to a complex commercial situation in a particular society
人们把一个名字赋予给某个特定社会中复杂的经济形势。
强调宾语：
It is the name that one attributes to a complex commercial situation in a particular society.
04对宾语补足语进行强调
例句：
They elected him the chairman of the Trade.
他们选他为工会的主席。
强调宾语补足语：
It was the chairman of the Trade Union that they elected him.
以上就是托福写作中四类强调句及其示例，希望对你有所帮助。更多托福写作备考资源，就在新航道托福考试频道。
