1

您

nín

you (courteous, as opposed to informal 你 nǐ)

2

今晚

jīnwǎn

tonight

3

有空

yǒukòng

to have time (to do sth)

=4

吗

má

(coll.) what?

=4

吗

mǎ

used in 嗎啡 mǎfēi

=4

吗

ma

(question particle for "yes-no" questions)