英语否定句和一般疑问句的用法

一般疑问句：以be动词,have /has/do等助动词、can/may等情态动词开头,以yes或no来回答的问句。它的基本结构是：Be/Have /Has/Did等助动词（包括情态动词）＋主语＋谓语（包括表语）＋┄?回答常用简略回答。1、谓语动词是be动词、助动词、情态动词时,只要直接把这些词置于句首,句末改成问号。eg。There''s something wrong with his bike。（改成疑问句） Is there anything wrong with his bike?2、谓语动词是行为动词时,必须在句首加上助动词Do、Does（三单）、Did（过去式）加上这些助动词后,句子中谓语动词必须用原形。eg。1)Edison built a science lab himself when he was ten。（改成疑问句） Did Edison build a science lab himself when he was ten?注意：在把肯定句改成否定句或一般疑问句的时候,要注意句中是否有already、some、something、somebody等词,如果有也必须进行改变,already要改成yet,some、something、somebody等分别改成any、anything、anybody等。另外,在改成否定句的时候注意把too改成either,both改成neither,all改成none等。在改成一般疑问句的时候,常常把第一人称I、we改成第二人称you。否定句就是在上述情况下,助动词后面加not就可以了。He is a boy。(He is not a boy。) He works in a hospital。(He doesn''t work in a hospital。) He can swim。(He can not swim。)