=1

你

nǐ

you (informal, as opposed to courteous 您 nín)

=1

你

nǐ

you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)

2

昨天

zuótiān

yesterday

3

發生

fāshēng

to happen; to occur; to take place; to break out

=4

了

le

(completed action marker) (modal particle indicating change of state, situation now) (modal particle intensifying preceding clause)

=4

了

liǎo

to finish (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget") (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least to understand clearly (variant of 了 liǎo)

=4

了

liǎo

(of eyes) bright clear-sighted to understand clearly

=4

了

liào

unofficial variant of 瞭 liào

5

什麼事

shénmeshì

What's up?; Is something the matter? (coll.) (used in rhetorical questions of the form 关 guān + {person} + 什么事 shénmeshì "what business is it of {person}'s?; what's it to {person}?")