一、解析
首先否定句是 I was not / wasn't very happy.然后句意是 :我不是很开心。因为这句话里面有be动词was,was是am的过去式,所以否定句在was后面加not即可,was not也可以缩写为 wasn't,所以否定句是I was not / wasn't very happy.然后句意是 :我不是很开心。
二、拓展——变句思路
(1)有 be ,be后面加 not。
例一: He is my uncle .(他是我的叔叔)
这句话里面有be 动词 is,否定句在 be 动词 is 后面加not,is not 可以完整写,也可以缩写为 isn't
即 否定句:He is not / isn't my uncle .(他不是我的叔叔。)
(2) 有 can,can后面加 not。
例二: She can dance .(她会跳舞,)
这句话里面有情态动词 can,所以否定句在can 后面加 not ,can not 可以完整写,也可以缩写为 can't
即 否定句:She can not / can't dance .(她不会跳舞。)
(3)无 be 无 can找实意动词,前面加don't 或 doesn't或didn't,此时动词需要还原。
例三: She wants to go to the park .(她想要去公园。)
这句话根据 wants判断句子一般现在时,并且第三人称单数,所以实意动词 wants 前面加入找动词 doesn’t ,动词还原为want 。
即 She doesn't / does not want to go to the park.(她不想要去公园。)
(4) and 变成 or,some 变成 any 。
例四:I can do some housework. (我会做家务。)
这句话里面有情态动词can,否定句情态动词can后面加not,也可以缩写成can't,some变成any,
即 I can't / can not do any housework. (我不会做家务。)
(5)当肯定句中含有have(has)to,must,should,need等情态动词时,改为否定句,有两种构成法,一种借助do,一种不借助do(仅限于现在时和过去一般时),另一种直接后面加not多数人用第一种形式。
第一种:I needn't / need not to do the housework.(我不需要做家务。)
第二种:I don't /do not need to do the housework.(我不需要做家务。)
(6)当肯定句中含有too,also时,改为否定句,须将too,also改为either。
(7)当肯定句中含有always时,改为否定句,须将always改为never。
(8)当肯定句中含有already时,改为否定句,须将already改为yet。
(9)当肯定句中含有nearly时,改为否定句,须将nearly改为hardly。
三、练习
1 I liked playing football in our school. (我喜欢在我们学校里踢足球。)
否定句:I did not / didn't like playing football in our school. (我不喜欢在我们学校里踢足球。)
2 She was a nurse..(她是一名护士。)
否定句:She was not / wasn't a nurse.(她不是一名护士。)
原句:I was very happy.(我很高兴。)
改为否定句:I was not very happy.(我不是很高兴。)
英语中陈述句改为否定句怎么改?
1、句中有be动词(am/is/are/was/were)的,在be动词后加not。
如:I can swim.——I can't swim.
He is a math teacher. → He is not a math teacher.
2、句中有情态动词的(can/should/must/would),在情态动词后面加not;
如:There will be a new building next year. → There will not be a new building next year. (will not可以缩写为won’t)
3、句中没有be动词和情态动词的,在动词前加don’t或doesn’t
① 句中动词为原形的,加don’t .如: I like apples. I don’t like apples.
②句中动词为三单式的,加doesn’t,并将三单式的动词还原成原形。
如:He likes apples. He doesn’t like apples.
4、肯定句中的some在否定句中应改为any
如:There are some students in the classroom. There are not any students in the classroom.
特殊形式的否定句:
(1)肯定句含有every-的合成词时,变否定句时改为no-。
如:Everything is ready.→Nothing is ready.
(2)肯定句中含有always, usually和ever时,变否定句时改为never。
如:He is always late for school.→He is never late for school.
(3)肯定句含有many,much时,变否定句时分别改为few,little。
如:Many students know him.→Few students know him.
(4)肯定句中含有still时,变否定句时应改为no longer。
如:Tom is still in bed.→Tom is no longer in bed.
(5)肯定句含有both, both...and,all时,变否定句时应改为never,neither...nor,none。
如:Both of us are students.→Neither of us is a student.
(6)肯定句含有nearly, almost时,变否定句时应改为 hardly。
如:Lily nearly knows him .→Lily hardly knows him .
(7)肯定句含有“形容词+ enough”时,变为否定句时应改为“too +形容词的反义词”。
如:He is short enough to reachit.He is too tall to reach it.