主语是a boy and a girl,谓语动词用单数还是复数如题

主语是a boy and a girl,谓语动词用单数还是复数如题 a boy and girla boy and a girl和a boy and a girl区别 This is a boy and a girl.为什么不说these are a boy and a girl. man ,woman ,child ,a boy and a girl的复数 a girl and a boy谓语用单数还是复数 I am a boy and you are a girl There is a boy and a girl.翻译成“这是一个男孩和一个女孩”对吗? Every boy and every girl是has a ball 还是have a ball, 主语是every boy and every girl 谓语用is还是用are?为什么? The boy and the girl has 还是have a dog. many a boy and many a girl __(be) clever every boy and every girl _(be) clever every boy and every girl 后面加复数还是单数形式注意是整个的哦，every boy and every girl这是一整个主语 each boy and each girl___ to help.A asks B is asked答案给的是A.但ask 是及物动词,何来 ask to do 本人认为是B答案.意欲考证下,望高手不吝赐教.Many thanks!PS：认为主语each boy and each girl是复数的,请嘴下留情, 应该填什么 Is your friend( She's a girl.A boy and girl B a boy and agirl C a boy or a girl D boy or girl Why is there a boy / girl?And is a silly boy / Who runs faster ,the boy or the girl?A.the boy.B.the girl is.c.the boy and the girl.为什么选A? Is___ a boy or girl? there（）a boy and a girl in the room.是填is还是are,说明理由