陈述句、疑问句是英语中两个基本而又重要的句型.如何改陈述句为一般疑问句是很多同学头痛的问题.这里我提供一些方法供大家一起学习.
首先,把动词进行分类,习惯上我把动词分为四大类.
A类：be 动词.形式有is,am,are,was,were.
B类：助动词.will(一般将来时助动词)+动词原形
would(一般过去时助动词)+动词原形
be(进行时助动词)+现在分词
have/has(现在完成时助动词)+过去分词
had(过去完成时助动词)+过去分词
be(被动语态助动词) +过去分词
C类：情态动词.主要有can,may,must,could,should等.
D类：实义动词,又称行为动词.实义动词种类、数量繁多,可记为除A类,B类,C类外的其它动词.
然后,根据动词的种类进行陈述句改一般疑问句.可分为两种情形.
第一种：把含有be 动词,助动词,情态动词的陈述句改为一般疑问句.基本方法是“一移三变”.
一移：把be 动词,助动词,情态动词移到句首.
三变：“一变”把陈述句主语的大写字母改为小写字母 （若主语是人名,大写不变）；“二变”把移到句首的动词的小写字母改为大写字母；“三变”把句号改为问号.
如：
He is a boy.
→ Is he a boy?
He will go to visit his friends.
→Will he go to visit his friends?
Tom is reading English .
→Is Tom reading English?
She has been to Beijing.
→Has she been to Beijing?
Many young trees were planted last year.
→Were many young trees planted last year?
Jim can sing.
→Can Jim sing?
第二种：把含有实义动词的陈述句改为一般疑问句.基本方法是“一加三变”.
一加：在陈述句句首加入Do(现在时且主语是第一人称、第二人称、复数,实义动词的形式为动词原形)/Does(现在时且主语是第三人称单数,实义动词的形式以-s或-es结尾)/Did(过去时,实义动词的形式通常以-ed结尾).
三变：“一变”把陈述句主语的大写字母改为小写字母 （若主语是人名,大写不变）；“二变”把陈述句中的实义动词改为动词原形（若实义动词为动词原形保持不变）；“三变”把句号改为问号.
如：
They like English.
→Do they like English?
He likes English.
→Does he like English?
Tom planted a tree yesterday.
→Does Tom plant a tree yesterday?
He went to visit his grandparents yesterday.
→Did he go to visit his grandparents yesterday?
最后,不论改含有哪种动词的陈述句为一般疑问句,都要注意以下两种情况.
1.若主语为第一人称（I,me,we,us,my,our等）,要改为第二人称(you,your之类).
2.若陈述句中含有some或some构成的不定代词,要把some改为any,把some构成的不定代词改为any构成的不定代词.
如：
We like English.
→Do you like English?
I have some books.
→Do you have any books?
I have something important to do.
→Do you have anything important to do?