a 是不定冠词,用于棵树名词前,表示数量或是种类
an 也是不定冠词,但是它是用于以元音因素开头的单词前 比如 an Apple
are is 都是be动词,当主语是第二人称或是名词复数的时候用are
当主语是第三人称单数或是名词单数时用is
these是这些的意思 后面跟可数名词的复数 this 是它的单数形式 意思是这个
a an are is these this it\'s what 怎么用?
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