这句话里面的that可以改成who吗?为什么?

这句话里面的that可以改成who吗?为什么? It's true that Americans eat these thing.里面的that可以改成who吗,那还可以改成什么 Is this the man that you served?这句话中that可以用who代替吗? Do you know the person that is talking to our principal.这句话的关系代词可以用that吗,还是一定要用who才可以? that改成who 就可以了This boss thatmy father worhed in his company many years ago is a very kind man.that改成who可以吗? I'm a high school student which come from BeiJing.这句话对吗?可以把which改成who吗. what is that guy's name?Dad 改成这样可以吗what is that guy who's name is dad that/who的省略问题,请分析3句话I am the guy (that/who) you know.I am the guy that/who want to see you .这两句话中,为什么上面一个可以省略（that、who）,下面一个不可以?另外,The books （that) I bought yesterday are s Who would you ask for help if you were robbed 这句话可以改成would you ask for help who you were robbed?为什么who在句子前面 that/who的省略问题I am the guy (that/who) you know.I am the guy that/who want to see you .这两句话中,为什么上面一个可以省略（that、who）,下面一个不可以?另外,The books （that) I bought yesterday are stolen, 为什么t That she should be ungrateful cut him to the heart.这句话可以改成It cuts him to the heart that she should be ungrateful吗 I want to find the girl ____from EnglandA,who comesB.that comes这句话是定语从句,先行词是人用woh,但是不可以用that代替吗 each year among the 250 million people who get sick because of water pollution这个定语从句who 可以改成that吗 It were you who made her sad.强调句中用were也可以吗我知道It was/is/will be that/who .这个句型可以只是想问were也一样可以吗?如果可以,It were you who made her sad.这句话的一般疑问句怎么改? It were you who made her sad.强调句中用were也可以吗我知道It was/is/will be that/who .这个句型可以只是想问were也一样可以吗?如果可以,It were you who made her sad.这句话的一般疑问句怎么改? 请问这句话可以改成形式主语it开头的句子吗?that the moon moves round the earth is well known to all of us如果可以请改 不要惊讶他无端入梦'这句话的 他可以改成它吗 不要惊讶他无端入梦'这句话的 他可以改成它吗哪个高手啊!