The pen is yours,mine is in my bag.这句话的主语为什么是"mine"

The pen is yours.改成同义词句 Is the pen yours 这里的yours是什么成分啊、? This pen is yours This is yours pen.为什么? The pen is yours,mine is in my bag.这句话的主语为什么是mine （ ）pen is yours,the red one or the blue one?括号里应该填什么? The pen on the table is yours.对on the table提问.用which还是用what kind of? 改错 This pen is me,yours is over there His age is the same as his wife's.最后还是应该用wife?I have the same pen as yours.和My pen is the same as yours.哪句是对的? 3.How long is his pen?_______ the _____ of his pen?4.My English isn’t as good as yours.Your English is _______ than _______. Whose is this pen?It looks ______ yours.介词急 填疑问词（ ）is the dress?---I's Kate's.( ) pen is yours?---The white one.( ) is that English?---I's coia.( ) is sevenpius three?---I's ten. This pen isn't the same as yours(同义句) My pen is red.What color is your pen?同义句填空 My pen is red.（ ）（ ）yours? Is the English-Chinese ( ) yours The second______( book ) is yours. The Choice Is Yours 歌词 the bed__the righ is yours