Question

求2个英语语法问题

1.be certain 和be sure这2个词语都有什么区别呀？在用法上．．．．
比如IT HE 后加哪个搭配，希望详细些
2.there is doubt和NO DOUBT后的搭配？谢谢

Answer 1

两者同意，通常可以互换。但常更有力地表示确实知道某事是真的时候用CERTAIN。而且各有的固定搭配影响到他们有时又不能互换。
be sure of
be sure to do
make sure
be sure of oneself
to be sure= indeed
for sure

for certain
make certain
be certain
二者的不同点:
1.在"It is certain that…/ to do something"结构中,It是形式主语,此时一般不用sure.如:
It is certain to take him a lot of time.肯定会占用他很多时间.
It is certain that two plus two makes four.二加二得四是确定无疑的.
2."Be sure +to do something"结构,用于祈使句,这时一般不用certain.如:
Be sure not to forget it.千万别忘了.
3.作定语时,sure表示"可靠的,无疑的".而certain修饰可数名词时,意为"某一,某些",修饰抽象名词时,意为"有点,有些".如:
The student made a sure answer.学生做出了确凿的回答.
A certain Brown is waiting for you at the gate.门口有个叫布朗的在等着你.
Certain students have failed in the test.有些学生测验没及格.
There was certain coldness in her attitude towards me.她对我的态度有点冷淡.
4.在口语中,sure可作副词,用在肯定答语中,相当于surely,certainly, of course,而 certain不能用作副词,如:Are you going Sure/Certainly.你去吗 当然啦

在肯定句中there is no doubt后加that,否定句或疑问句加whether

Answer 2

人称后面加 be sure 应译成“确信”，是主观认定的判断；如果加 be certain 可译为“确定”，是表达一种客观现实。
that woman is sure to be seen. 确信那女人会在现场。
that woman is certain to be seen. 确定那女人在现场。
从题目的表达来看，是一种客观叙述式，应该用certain。

there is doubt that 后跟所怀疑的事情。

Answer 3

it 后面一般用 be certain 句型是It is certain that，但也可以说he is certain about sth
be sure 一般用于某人对什么事情的肯定，如I am sure .
there is doubt that 后跟所怀疑的事情。

Answer 4

there is doubt加THAT

Answer 5

1.Sure和certain通常可以互换.但是,sure更能表示主观意愿,而certain 则意味着建立在经验或证据之上的确认,更客观些.如:
Never teach a child anything of which you are not yourself sure?(John Ruskin).
“不要将你自己都没有把握的东西教给孩子”（约翰·鲁斯金）。
In this world nothing is certain but death and taxes?(Benjamin Franklin). Confident suggests assurance founded on faith or reliance in oneself or in others:
“在这个世界上，除了死亡和税收没有什么事是确定的”（本杰明·富兰克林）。
2.doubt后接名词从句时, 疑问句和否定句用连词 that, but, but that, 肯定句一般用连接词 whether, if, what, when 等, 如肯定句用 that, 往往表示非常怀疑.如:
There is no doubt that he is guilty.
毫无疑问，他是有罪的。
I have (my) doubts about whether he is the best man for the job.
我怀疑他是否做这项工作的最好人选。
We have no doubt of his ability.
我们相信他的能力。