1

昨天

zuótiān

yesterday

2

他

tā

(third-person singular) (since the early 20th century, usu. male) he; him; his (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)

3

研讀

yándú

to study attentively (a book) to delve into

4

英語

Yīngyǔ

English (language)

=5

了

le

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

=5

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 無 wú or 不 bù) completely (not); entirely (not); (not) in the least to understand clearly (variant of 瞭 liǎo)

=5

了

liǎo

(of eyes) bright clear-sighted to understand clearly

=5

了

liào

unofficial variant of 瞭 liào

=6

嗎

má

(coll.) what?

=6

嗎

mǎ

used in 嗎啡 mǎfēi

=6

嗎

ma

(question particle for "yes-no" questions)