英语怎么改疑问和否定句的方法

Answer 1

一般疑问句：
如果是带be动词的句子，把be动词提前就可以了，如：
He is doing his homework.
Is he doing his homework?

They were at home yesterday.
Were they at home yesterday.

如果是实义动词的，则要在句首加一个相应时态的助动词，因为前面已经有助动词了，实义动词就要用原形，如：
He goes to school by bike every day.
Does he go to school by bike every day?

They went to Beijing last week.
Did they go to Beijing last week?

否定句：
如果是带be动词的，在be动词后面加not就可以了，be动词可以和not连在一起缩写，如：
She is a student.
She isn't a student.

We were at school yesterday.
We weren't at school yesterday.

如果是实义动词的句子，在主语后面用相应时态的助动词加not, 可以缩写，后面的实义动词变回原形，如：
She goes to work by bus every day.
She doesn't go to work by bus every day.

They bought a TV yesterday.
They didn't buy a TV yesterday.

希望能帮到你，祝更上一层楼O(∩_∩)O

Answer 2

改疑问句的方法：找到句子当中的谓语，确定是由be动词(am, is, are)还是实义动词(make, eat, play等)构成，如果是be动词，则将其提前至句首，句中的其他内容往后搬就可以了；如果是实义动词，则确定其时态，然后改成do的相应形态(do或does或did)，并将其置于句首，然后将实义动词make或eat或play等还原成原形，其他照往后搬……

改否定句的方法：找到句子当中的谓语，若是be动词，则在be动词后面加上not即可；若是实义动词，则根据句子时态使用do或does或did，在其后加上not，即可；句中其他内容及顺序保持不变。

举两个例子吧：
1.
原句：They are good friends.
疑问句：Are they good friends?
否定句：They are not goods friends.

2.
原句：They usually play football with classmates.
疑问句：Do they usually play football with classmates?
否定句：They don't usually play football with classmates.

希望可以帮到你~

Answer 3

Answer 4

疑问句:
如果原句是: 主语+谓语+宾语.... 改成为: 助动词+主语+谓语+宾.....?
如果原句是: 主语+BE动词+表语. 改成为: BE动词(am /is/are/was/were) +主语+表语?
否定句: 将not 放在助动词之后实义动词之前.

Answer 5

一般疑问句：be动词、情态动词提前

否定句：be动词、情态动词后加not