"She must be at least forty ."为什么要在must前加be?must后加be

She must be at least forty .为什么要在must前加be?must后加be She must be at home.(改为一般疑问句)she at home? She must be at least thirty-five years old.In my opinion she() a.has b.is c.must 为什么? She is at least five years old 和She must be at least five years old,区别 she must be hungry,___she? she who must be obeyed she must be at least thirty five years old.in ma opinion she____a:has b:is c:can d:must the old lady must be sent to hospital at once because she was___(terrible) ill I read she's twenty-nine,but she must be (填in on at except) least forty. she is ill.She ()to hospital at once.A.is sent B.must be sent 为什么不选A At the moment she _with her brother at home A may play B must be playing C can play D must play she must be at least thirey-five years old.课文翻译是她至少也有35岁了 must be 怎么没翻译呢 I think my mother good at cooking,and she must cooking nowI think my mother good at cooking,and she must cooking now.A is,is B was,be Cis,be I think she must be crazy! It must be she‘s 还是 hers? She must be fat.(变成否定句) The light in Mrs White’s bedroom is on.She ____ be at home now.填must还是 can That -------- be Mary.She is at home.选择：A can't B should C need D must