Usage note
忘记可以用来表达你忘记了某事。例如，你可能忘记带书包了。
wàngjì kě yǐ lái bǎo chū nǐ wàngjiào mǒu shì. rúkě, nǐ kěyǐ wàngjiào dài shūbāo le.
忘记 can be used to express that you forgot something. For example, you might forget to bring your backpack.
Context note
忘记常用于日常生活中的情景，比如忘记带钥匙、忘记吃药或忘记做作业。
wàngjì cháng yòng yú rìkān shēnghuó zhōng de qíngjǐng, bǐrú wàngjiào dài késī, wàngjiào chīyào huò wàngjiào zuò zuòyè.
忘记 is often used in daily life situations such as forgetting to bring keys, forget to take medicine or forget to do homework.
5 examples
我忘记带钥匙了。
wǒ wàng jì dài yào shi le。
I forgot to bring my key.
他忘记吃早饭了。
tā wàng jì chī zǎo fàn le。
He forgot to have breakfast.
昨天我忘记做作业了。
zuó tiān wǒ wàng jì zuò zuò yè le。
Yesterday I forgot to do my homework.
妈妈忘记买菜了。
mā ma wàng jì mǎi cài le。
Mom forgot to buy vegetables.
我们忘记关窗户了。
wǒ men wàng jì guān chuāng hù le。
We forgot to close the window.
5 mini stories
小明忘记带作业本了，所以他没有完成作业。
xiǎo míng wàng jì dài zuò yè běn le， suǒ yǐ tā méi yǒu wán chéng zuò yè。
Xiaoming forgot his homework book, so he didn't finish his homework.
妈妈忘记给爸爸买生日礼物了，所以爸爸很失望。
mā ma wàng jì gěi bà ba mǎi shēng rì lǐ wù le， suǒ yǐ bà ba hěn shī wàng。
Mom forgot to buy Dad a birthday gift, so Dad was very disappointed.
小红忘记吃药了，她感觉不舒服。
xiǎo hóng wàng jì chī yào le， tā gǎn jué bù shū fú。
Xiaohong forgot to take her medicine, she felt unwell.
老师忘记布置作业了，同学们都很高兴。
lǎo shī wàng jì bù zhì zuò yè le， tóng xué men dōu hěn gāo xìng。
The teacher forgot to assign homework, the students were very happy.
爸爸忘记带钱包了，所以他没有买咖啡。
bà ba wàng jì dài qián bāo le， suǒ yǐ tā méi yǒu mǎi kā fēi。
Dad forgot his wallet, so he didn't buy coffee.
Mini dialogue
带东西
A
糟糕，我忘记带水壶了。
Zāogāo, wǒ wàngjì dài shuǐhú le.
Oh no, I forgot to bring my water bottle.
B
别忘记下次要记得哦。
Bié wàngjì xià cì yào jìde o.
Don't forget to remember next time.
提醒
A
你忘记关灯了。
Nǐ wàngjì guān dēng le.
You forgot to turn off the light.
B
谢谢提醒，我差点忘记。
Xièxie tíxǐng, wǒ chàdiǎn wàngjì.
Thanks for reminding me, I almost forgot.
Related words and contrasts
opposite
记得
jì de
remember
The opposite of forgetting.
similar
忘掉
wàng diào
forget completely
A stronger way to say forget.
contrast
记住
jì zhù
memorize
To keep something in memory, unlike forgetting.