which
[代词]
used to ask or talk about one or more members of a group of things or people, when we are not sure about it or about them

哪个, 哪一个
across
[副词]
from one side to the other side of something

穿过, 横跨
Ex: She across easily despite the strong current .
grammar
[名词]
the study or use of words and the way they are put together or changed to make sentences

语法, 文法
adverb
[名词]
a word that gives more information about a verb, adjective, or another adverb

副词, 状副词
Ex: The teacher asked the students to list down adverbs for homework .

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