He put his hand into his pocket.中put为什么不用第三人称单数形式

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• He put his hand into his pocket.中put为什么不用第三人称单数形式
• He says he has drink his milk.这句是什么时态?新概念一,第102课,课后练习：书中给出的例句：He is drinking his milk.改成间接引语后：He says he has drink his milk.这个间接引语我会改,我不懂的是这句中的has drink his milk中的has是什么作用,这句中我也知道has是have的第三人称单数形式,那如果换成其他人称如第三人称复数,they say they have drink their milk.这里have drink是什么意思,drink本身都是喝了,为什么还有个have.原句中到底has是干什么的.以下是给出的题：1、she is shutting the door.改后：she says she has shut the door.2、he is putting on his coat.改后：he says he has put on his coat.3、he is reading thi
• He put his hand into his pocket.中put为什么不用第三人称单数形式
• while 后面必须借动词的ing形式吗?She listened to her favourite rock music while singing along with the words.She was putting on her jeans while asking me to hand her the sweater.He banged on the door while opeaning it.In the bathroom she put on some makeup while loojing in the mirror.The school master looked angrily at the naughty student while talking with his parents看了很多例句都是这样,为什么必须加V-ing?而when后面为什么可以加动词原形呢》when 后面加非延续性动词，为什么就是正常的过去时？while 后面加延续性动词为什么就是ing形式？
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