IV. The negative form of the 'shì 是 ... de的 ' construction
The negative form uses bù不, which is placed before shì 是.
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Wǒ bú shì zài Měiguó xué de Yīngwén, wǒ shì zài Yīngguó xué de.
我不是在美国学的英文,我是在英国学的。
It was not in America that I studied English, it was in England.
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Zhèi jiàn shìqíng bú shì tā gàosù wǒ de.
这件事情不是他告诉我的。
It was not he who told me about it.