Usages of bù
我 不 是 老师。wǒ bú shì lǎoshī.
I am not a teacher.
Note how bù (falling tone) changes it's pronunciation to bú (rising tone) when followed by a falling tone.
这 个 人 不 是 老师。zhè gè rén bú shì lǎoshī.
This person is not a teacher.
我 不 要 茶。wǒ bú yào chá.
I don’t want tea.
我 不 吃 米饭。wǒ bù chī mǐfàn.
I don’t eat rice.
我 不 要 水,我 要 一 杯 茶。wǒ bú yào shuǐ,wǒ yào yì bēi chá.
I don’t want water; I want a cup of tea.
昨天 我 跟 她 说 我 不 能 去。zuótiān wǒ gēn tā shuō wǒ bù néng qù.
Yesterday I told her I couldn’t go.
因为 我 很 忙, 所以 我 不 能 跟 你 一起 去 看 电影。yīnwèi wǒ hěn máng, suǒyǐ wǒ bù néng gēn nǐ yìqǐ qù kàn diànyǐng.
Because I am very busy, I can’t go watch a movie with you.
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