强调句型的基本模式为“it is ...that”“it is ...which”或“it is ...who”,如果强调对象为事物，可以使用前两个模式中的一个，荣国强调对象为人，使用第一和第二模式皆可。将需要加以强调的成分与原句分离，置于该句型之中，原句的其他成分位于that, which或who 之后。系动词有过去时的变化。
It is ...that模式
It is this type of exploitation that should be discouraged.
It is not necessarily these small languages that are about ti disappear.
It is the light of an expectation that some observations are held to be relevant and some irrelevant.
Of the six pollutants monitored by the WHO-carbon dioxide, nitrogen dioxide, ozone,sulphur dioxide, lead and particulate matter - it is this last category that is attracting the most attention from health researchers.
It is ...which 模式
It was this lack of repair work which was directly responsible for the explosion.
Work science is dominated today by a small number of languages, including Japanese, German and French, but it is English which is probably the most popular language of science.
It is ...who 模式
It was above all the French, followed closely by the Americans, who were the most passionate exporters of the new invention.
In terms of artistic development it was again the French and the Americans who took the lead.
It wasn’t until the discovery of the reaction principle, which was the key to space and so represents one of the great milestones in the history of scientific thought, that rocket technology was able to develop.
直到反作用原理 -- 宇宙航行的理论，代表科学思想史上的伟大里程碑之一 --- 发现之后，火箭技术才得以发展。
It was not until the eighteenth century that Europe became seriously interested in the possibilities of using the rocket itself as a weapon of war and not just to propel other weapons.
What is it that makes them happy and fulfilled, while others seem doomed to founder in misery dissatisfaction and dejection?
Their aim is to find out why it is that some people’s lives go so right.
A person needs to know who he or she before being able to know what it is that makes him or her happy.