I won't be free this afternoon.I'll be seeing a friend off.1.为什么free为原型,see要加ing?2.说明一下be和do用法的区别.

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I won't be free this afternoon.I'll be seeing a friend off.1.为什么free为原型,see要加ing?2.说明一下be和do用法的区别.
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I won't be free this afternoon.I'll be seeing a friend off.1.为什么free为原型,see要加ing?2.说明一下be和do用法的区别.
I won't be free this afternoon.I'll be seeing a friend off.
1.为什么free为原型,see要加ing?
2.说明一下be和do用法的区别.

I won't be free this afternoon.I'll be seeing a friend off.1.为什么free为原型,see要加ing?2.说明一下be和do用法的区别.
free在这里是形容词,接在be后面不需要加ing,而see是动词,在be后面要加ing,在这里will be doing形式表示将要干什么
be和do的区别:be是系动词,后面接表语,一般是be doing形式,do是助动词,一般是do sth形式