1

您

nín

you (courteous, as opposed to informal 你 nǐ)

2

有空

yǒukòng

to have time (to do sth)

=3

嗎

má

(coll.) what?

=3

嗎

mǎ

used in 吗啡 mǎfēi

=3

嗎

ma

(question particle for "yes-no" questions)