What's your name?中的your为什么要加R?

What’s your name? What's your name? what‘s your name what‘s your name? What's your name?中的your为什么要加R? what's your my name? Hello,what's your name? what's your given name What's your name,Please? E___me,what's your name? what's your name? 英译汉 What's your name? 是什么意思 What's your name?意思 What's your name?为什么不是your name is what? What's your name(变为同义句)What's your name(变为同义句)your name? What's your good friend's name? Tom,what's your mother's name? What's your mother's name?