it is/was +被强调的部分+that/who+其他
it was he that broke the window
it was him who borke the window
it was her that we met at the school gete.
it was in the park that tom lost his watch
it is not..until..+被强调的部分+其他
it was not until she took off her dark glasses that i recognized her.
需要强调谓语时，用助动词do does did,indeed.
do come this evening,./he did write to you last week
what引导的名词性从句在句首充当主语,what..is..
what you should do next is go it over
