初中英语学习辅导：变否定句的几个注意。
一。将肯定句变为否定句时，一般情况下在句中助动词。系动词或情态动词后加not。但有时并非如此，而是要改变句中的某些词。现列举如下：
(一)改变副词。例如：
is always late for school.→
he is never late for school.
boy almost always goes to bed at 10 o'clock.→
the boy hardly ever goes to bed at 10 o'clock.
is still a worker.→
he is no longer a worker.
(二)改变连词。例如：
both jim and tom like reading.→
neither jim nor tom likes reading.
(三)改变不定代词。例如：
all of the students are from the countryside.→
none of the students are from the countryside.
(四)改变限定词。例如：
spent much time playing every day.→
he spent little time playing every day.
people know the news.→
few people know the news.
二。肯定句变否定句时，既可以在句中助动词。系动词或情态动词后加not,也可以不加not,而只须改变句中的某些词。例如：
1. he knows everything about your school.→
he doesn't know anything about your school.
he knows nothing about your school.
2. i know both of them.→
i don't know either of them.
i know neither of them.
feels happy today.→
tom doesn't feel happy today.
tom feels unhappy today.
boy looks like his father.→
the boy doesn't look like his father.
the boy looks unlike his father.
三。变否定句时，某些形容词。不定代词。副词等也随之改变。例如：
1. i can see some mountains far away.→
i can't see any mountains far away.
has already had breakfast.→
he hasn't had breakfast yet.
can swim, too.→
we can't swim, either.
likes meat a little.→
jim doesn't like meat at all.
四。当主句谓语动词是think, suppose, believe, guess和imagine等时，后面的宾语从句要表示否定意义时，通常将not提到主句的位置上。例如：
i think his proposal is valuable.→
i don't think his proposal is valuable.
注：not和代词all, each, everyone, everybody及副词both, quite, altogether, always等连用时表示部分否定。例如：
all the students prefer maths.并非所有的学生都喜欢数学。
is not always sunny here.这里并不总是阳光普照。
answer is not quite proper.这个答案不完全正确。
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