千万 qiānwàn， 千 means thousand 万 means then thousands but we use 千万 for must or can use for make certain. 千万 used starting in the sentence. If we use 千万 with 不能，不要，别, it means the speaker commands someone no to do something.
STRCTURE :
千万 qiānwàn + verb + sentence
EXAMPLE ：
千万不要赌钱。
qiānwàn bùyào dŭqián。
don't play gamble.
千万要小心。
qiānwàn yào xiăoxīn
Must be careful
千万别生气。
qĭng qiānwàn bié shēngqì
please don't be angry.
千万别碰那机器。
qiānwàn biépèng nà jīqì
Don’t touch that machine.
你千万要记住老师的话.
Nǐ qiānwàn yào jìzhù lǎoshī de huà.
Be sure to remember what the teacher said.
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