The 是……的 structure is used to emphasize the time, place, or manner of something that has already happened.
Structure: Subject + 是 + emphasized part + 的
Examples:
我是昨天来的。I came yesterday.
他是坐飞机来的。He came by plane.
我们是北京认识的。We met in Beijing.
Exercise: Rewrite the sentences using 是……的
我昨天去学校了。
→ 我是昨天去学校的。It was yesterday that I went to school.她坐火车去上海了。
→ 她是坐火车去上海的。She went to Shanghai by train.我们在公园见面了。
→ 我们是在公园见面的。It was in the park that we met.他今天早上八点起床的。
→ 他是今天早上八点起床的。It was at 8 a.m. that he got up.妈妈用手机付钱了。
→ 妈妈是用手机付钱的。Mom paid with her phone.
Tip:
是……的 is only used for past events. The negative form is 不是……的.

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