翻译1． Can this be important? No．This may not beimportan
2．Can　it　be　electricity?
　　Yes．It　must　be　electricity．
3．Can　this　building　be　dangerous?
　　Yes,this　builing　may　be　in　danger．
4．May　he　be　a　scientist?
　　Yes．He　must　be　a　scingtist．
5．Can　this　experiment　be　quite　useful?
No．This　experiment　may　not　be　useful．