several
[限定词]
used to refer to a number of things or people, more than two but not many

几个
Ex: She received several invitations to different events this weekend.这个周末,她收到了**几份**参加不同活动的邀请。
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
Ex: I can't remember which book I lent to Sarah.我不记得我借给Sarah**哪本**书了。
whenever
[连词]
at any or every time

每当, 无论何时
Ex: You can call me whenever you need assistance .你**随时**可以打电话给我,如果你需要帮助。
across
[副词]
from one side to the other side of something

横过, 到另一边
Ex: The river was too wide to paddle across.河太宽了,划不**过去**。
grammar
[名词]
the study or use of words and the way they are put together or changed to make sentences

语法, 句法
Ex: We studied verb tenses in our grammar class today .今天我们在**语法**课上学习了动词时态。
letter
[名词]
any of the characters in the alphabet that stand for a sound

字母, 字符
Ex: The teacher told me to write each letter clearly .老师告诉我把每个**字母**写清楚。
word
[名词]
(grammar) a unit of language that has a specific meaning

词, 单词
Ex: Understanding every word in a sentence helps with comprehension .理解句子中的每个**词**有助于理解。
phrase
[名词]
a group of words put together in a meaningful way

短语, 表达
Ex: She was confused by the phrase " break a leg , " until she learned it 's a way to wish someone good luck .她对“break a leg”这个**短语**感到困惑,直到她了解到这是一种祝愿某人好运的方式。
adverb
[名词]
a word that gives more information about a verb, adjective, or another adverb

副词, 一个提供更多关于动词、形容词或其他副词信息的词
Ex: The teacher asked the students to list down ten adverbs for homework .老师要求学生列出十个**副词**作为家庭作业。
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