是…的
shì…de
是…的 is a spotlight on something already done
The picture The event already stands on the stage. You switch on one spotlight and light up a single part of it: when, where, who, or how.
Where the picture shows up in 是…的
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spotlight on the means
我是坐地铁来的。
wǒ shì zuò dìtiě lái de
I came by subway.
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spotlight on the time
你是什么时候到的？
nǐ shì shénme shíhou dào de
What time did you get here?
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spotlight on the place
这件衣服是在网上买的。
zhè jiàn yīfu shì zài wǎng shàng mǎi de
I bought this online.
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spotlight on the year
他是去年来北京的。
tā shì qùnián lái Běijīng de
He came to Beijing last year.
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spotlight on the person
这是谁做的？
zhè shì shéi zuò de
Who made this?
To announce that something happened, use 了. Use 是…的 when everyone already knows it happened and only the how is in question.