the是定冠词,a ,an是不定冠词,to ,for,with ,是介词,be是原型,has是have的单三形式,have been是完成时,do是助动词,did是其过去式,does是单三形式.额,懂了没?
the,a,an,to,for,with,about,be,has,have,been这些介词什么的请问怎么区分啊?
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