=1

这

zhè

(pronoun) this; these (bound form) this; the (followed by a noun) (bound form) this; these (followed by a classifier) (in this sense, commonly pr. zhèi, esp. in Beijing)

=1

这

zhèi

(coll.) this

=2

是

shì

to be (followed by substantives only) correct; right; true (respectful acknowledgement of a command) very well (adverb for emphatic assertion)

=2

是

shì

variant of 是 shì

3

火车站

huǒchēzhàn

train station

=4

吗

má

(coll.) what?

=4

吗

mǎ

used in 吗啡 mǎfēi

=4

吗

ma

(question particle for "yes-no" questions)