Who is this 是正确的句子吗?怎么回答?

Who is this 是正确的句子吗?怎么回答? Who is this?一般怎么回答? who is that speaking?为什么回答是This is...speaking who is this young man?he is jim 和this is jim?哪个回答是对的?为什么? who is 怎么回答 who is this 或Who is that的回答可以用she is 或he is吗还是必须用this is 或th Who is she怎么回答 英语翻译这是谁?我妈妈.翻译成英语是who is this 回答 she is my mother还是 回答 this what is mum going to cook tonight?怎么回答?who weote this letter What is this怎么回答,是It is+a/an Who/What are these?的回答These are..也能说是对的吗?单数的时是用This/That is. Is this English class?正确回答