同学你好，该知识点来自沪江网校《大学英语六级全程备考班【小橙卡专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学，你好~

同学的理解是正确的。强调句中，去掉It is(was)...that/who，还原还是一个完整的句子，翻译成“正是。。。”例如：It is he that should do his homework.去掉后仍是完整句子:He should do his homework.  
举一个不是强调句的例子：It may be my bike that he is riding.这不是强调句，去掉it is...that，句子变成my bike he is riding，句子不通顺，所以这不是强调句。that在这儿 引导定语从句，修饰bike。

希望助助解答可以帮到同学，祝同学学习进步~