.keep好既是實義動詞同是又是系動詞,作為實義動詞,它是一個及物動詞,這時它后面接賓語,作為系動詞它后面接形容詞作表語.

eg:We must keep our classroom clean.(這句中的keep是及物動詞)

常見的系動詞還有l(wèi)ook,feel,taste,smell,get,go,come,become,

turn,grow.

eg:Child though he is ,he knows a lot.這是一個高中語法,你以后就會學(xué)到.

3.crowded不是不及物動詞而是形容詞,它的動詞形式是crowd它既是一個及物動詞,又是一個不及物動詞,

eg:He crowded more books onto the shelf.