Subject + 没有 + Verb/Noun
The word 没有 (méiyǒu) is used to negate past actions or the existence of something. It indicates that something did not happen or does not exist. Unlike 不, which negates habitual actions or future intentions, 没有 specifically negates completed or experiential actions.
我昨天没有去上课,因为生病了。
Wǒ zuótiān méiyǒu qù shàngkè, yīnwèi shēngbìng le.
I didn't go to class yesterday because I was sick.
冰箱里没有牛奶了,你去买一些吧。
Bīngxiāng lǐ méiyǒu niúnǎi le, nǐ qù mǎi yīxiē ba.
There's no milk left in the fridge; go buy some.
他没有告诉我这件事,我完全不知道。
Tā méiyǒu gàosù wǒ zhè jiàn shì, wǒ wánquán bù zhīdào.
He didn't tell me about this; I had no idea at all.