It is (was) + 被强调部分+that 从句 例：
一般句子：Tom went to the cinema last night.
强调句：1）对主语进行强调：It was Tom that went to the cinema last night.
2) 对时间状语进行强调：It was last night that Tom went to the cinema.
备注：1）这种强调句结构,如果是对主语进行强调的话,that 还可以换为who；
2）这种强调结构除了对主语、状语进行强调,还可以对宾语进行强调；
3） is 或was的选择要根据句子的时态来确定；
4）这种强调句的结构特点是：去掉强调结构的句型结构,句子仍然成立.