two to too,哪一个与其他两个不一样？

Question

don't deaw ( )pens.
the music rooms are ( ) the second floor.
Mary helps her friends( )their chinese.

Answer 1

从词性看是two ,其他两个都可以是副词
从读音看是to 其他两个是长元音u:

Answer 2

to,
发短音／u/
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Answer 3

two这指的是数字二
too表示也的意思，一般用在句末
to一般只动词不定式或介词
欢迎追问哦
don't deaw ( two )pens.
the music rooms are ( to ) the second floor.
Mary helps her friends( to )their chinese.