1

你們

nǐmen

you (plural)

2

昨天

zuótiān

yesterday

3

在學

zàixué

to be at school; to be studying

=4

校

jiào

to check; to collate; to proofread

=4

校

xiào

(bound form) school; college (bound form) (military) field officer

=5

嗎

má

(coll.) what?

=5

嗎

mǎ

used in 吗啡 mǎfēi

=5

嗎

ma

(question particle for "yes-no" questions)