四年级英语肯定句转否定句练习题20题
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四年级英语肯定句转否定句练习题20题
1.I am a student.
A.I am not a student.
B.I am no student.
答案解析：A。
肯定句变否定句，在be 动词后加not。
B 选项的表达不常用。
2.He is a teacher.
A.He is not a teacher.
B.He isn't teacher.
答案解析：A。
is 的否定形式是is not。
B 选项缺少a。
3.She has a book.
A.She doesn't have a book.
B.She has no book.
答案解析：A。
have 的否定形式要用助动词do 来构成，she 是第三人称单数，用does，再加not。
B 选项的表达不常用。
4.They are friends.
A.They are not friends.
B.They aren't friend.
答案解析：A。
are 的否定形式是are not。
B 选项缺少s。
5.I like apples.
A.I don't like apples.
B.I not like apples.
答案解析：A。
like 的否定形式要用助动词do 来构成，再加not。
B 选项表达错误。
6.He plays football.
A.He doesn't play football.
B.He not play football.
答案解析：A。
plays 是第三人称单数形式，否定形式要用助动词does，再加not。
B 选项表达错误。
7.She sings well.
A.She doesn't sing well.
B.She not sing well.
答案解析：A。
sings 的否定形式要用助动词does，再加not。
B 选项表达错误。
8.We go to school.
A.We don't go to school.
B.We not go to school.
答案解析：A。
go 的否定形式要用助动词do 来构成，再加not。
B 选项表达错误。
9.They have pencils.
A.They don't have pencils.
B.They have no pencils.
答案解析：A。
have 的否定形式要用助动词do 来构成，they 是复数，用do，再加not。
B 选项的表达不常用。
10.I am happy.
A.I am not happy.
B.I am no happy.
答案解析：A。
肯定句变否定句，在be 动词后加not。
B 选项的表达不常用。
11.I am happy.
I am not happy.
答案解析：本题中“am”是be 动词，变否定句在be 动词后加“not”。
12.She has a beautiful dress.
She doesn't have a beautiful dress.
答案解析：“has”表示“有”，当主语是第三人称单数时，变否定句借助“doesn't”，后面动词用原形。
13.They are playing football.
They are not playing football.
答案解析：“are”是be 动词，变否定句在be 动词后加“not”。
14.The book is interesting.
The book is not interesting.
答案解析：“is”是be 动词，变否定句在be 动词后加“not”。
15.He runs fast.
He doesn't run fast.
答案解析：“runs”是动词第三人称单数形式，变否定句借助
“doesn't”，后面动词用原形。
16.We like apples.
We don't like apples.
答案解析：“like”是实义动词，主语是“we”，变否定句借助“don't”。
17.The cat is cute.
The cat is not cute.
答案解析：“is”是be 动词，变否定句在be 动词后加“not”。
18.She can sing well.
She can't sing well.
答案解析：“can”是情态动词，变否定句在其后加“not”。
19.They have many friends.
They don't have many friends.
答案解析：“have”表示“有”，当主语是“they”时，变否定句借助“don't”，后面动词用原形。
20.The boy is tall.
The boy is not tall.
答案解析：“is”是be 动词，变否定句在be 动词后加“not”。