playing是非动词吗?playing是作为现在进行时吗?如上,

playing是非动词吗?playing是作为现在进行时吗?如上, playing playing I am looking at the children playing volleyball .playing volleyball 是非谓语动词中的动词ing作宾语补足语.to play不定式 不能做宾语补足语吗 she is playing中is是什么词是系动词吗 Does she like playing basketball?为什么does后面的playing不是动词原形,不是does加动词原形吗 动词后面加ing例：playing She is playing the piano now句子中playing不是动词吗?为什么还会有be,be不是在没有动词的时候使用吗? 英语中be动词和实义动词可以连用吗?请详解,谢谢.Look,the children are playing basketball on the ground. are playing 做谓语对吗? 动词ing就是动名词吗比如说playing soccer 是动名词吗? They are playing over there.的谓语部分是助动词+实意动词构成的吗?为什么 because of能否加动词inghis reamarks droped because of playing computer,是对的吗 现在进行时：be doing 一定要加be动词吗 如：the litter boy【 】（play）with a car.是is playing还是playing They are playing ------{happy} under the tree.-------填什么?playing不是动词，是动名词 Look!You can see Lucy playing soccer.为什么用playing,没有be动词啊 playing hula playing by playing the