我昨天上当了,亏了很多钱。
wǒ zuótiān shàngdàng le , kuīle hěnduō qián 。
I was fooled yesterday and lost a lot of money.
他总是上当,真让人担心。
tā zǒngshì shàngdàng , zhēnràngrén dānxīn 。
He always gets duped, which really worries me.
我们千万不要上当,必须小心。
wǒmen qiānwàn búyào shàngdàng , bìxū xiǎoxīn 。
We must not be fooled at all; we have to be careful.