I think she must be over forty.有语法错误吗

I think she must be crazy! I think she must be over forty.有语法错误吗 英语：I think she must be a teacher,___?怎么写?为什么不用must she呢？ she must be in red .no,（ ）she wears a green coatA：she is B:she must not C:I dou't think so.D:I am not I think t___ must be very delicious I think you must be crazy. I think you must be learned.翻译 I think it must be的意思 I THINK YOU MUST BE CARZY i think you must be a teacher是什么意思must be为什么不是must are?must I think she can be a fairy I think she _____(be) back soon. 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 think I must be insane,I should get lost,should ①she must be fifty（对划线部分提问）划线的是fifty②she must be reading（变否定句）③I think the woman can be the youngest of us.（变否定句） Lily hasn't come to school yet,I think she ____ be ill,because she never comes late.A,should B,must I think it must be very nice中文 I think this guy must be crazy!哈哈