wǒ zài èr shí yī lóu.
I'm on the twenty-first.
nǎi nai bāo jiǎo zi de shí hou, wǒ zǒng xǐ huan zhàn zài páng biān kàn.
When grandma made dumplings, I always liked to stand next to her and watch.
zhè zhī xiǎo gǒu jiào dòu dou, sān nián qián zài gōng yuán lǐ zǒu diū le.
This little dog, named Doudou, got lost in a park three years ago.
wǒ xià bān huí dào jiā mén kǒu cái fā xiàn, yào shi wàng zài bàn gōng shì le.
I only realised when I got to my front door after work: I'd left my keys at the office.