=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

女朋友

nǚpéngyou

girlfriend

=3

是

shì

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

=3

是

shì

variant of 是 shì

4

俄罗斯人

Éluósīrén

Russian (person)

=5

吗

má

(coll.) what?

=5

吗

mǎ

used in 嗎啡 mǎfēi

=5

吗

ma

(question particle for "yes-no" questions)