it强
调句
强调主语，主语为人时，that可换成who：
It is /was＋主语＋that /who＋其他成分
It was my father that /who did the experiment in the lab yesterday evening.
It was we that /who arrived there first, though we went a wrong way.
强调宾语，宾语为人时，可用that /who：
It is /was＋宾语＋that /who＋其他成分
It was the experiment that my father did in the lab yesterday evening.
It was his sister that /who Tom met at the school gate yesterday.
强调时间状语：
It is /was＋时间状语＋that＋其他成分
It was on Monday night that all this happened.
It was yesterday that Tom met his sister at the school gate.
强调地点状语：
It is /was＋地点状语＋that＋其他成分
It was at the school gate that Tom met his sister yesterday.
It was in the store that my father bought the cake.
it强调句的一般疑问句：
Is /Was it＋被强调部分＋that＋其他成分？
Was it Lucy that phoned just now?
Was it last year that the building was completed？
it强调句的特殊疑问句：
疑问词(被强调部分)＋is /was it＋that＋其他成分？
Why was it that you didn't attend the meeting?
How was it that he went to school？
强调主语从句：
It is /was＋主语从句＋that＋其他成分
It was what he said at the party that made her so angry.
强调状语从句：
It is /was＋状语从句＋that＋其他成分
It was only when I reread his poem that I began to appreciate its beauty.
not until句型中的强调：
It is /was＋not until...＋that＋其他成分
It was not until 12 o'clock that he went to bed.
It was not until the last operation was finished that Bethune left the battle hospital.
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