1.
A victory is unlikely but not impossible.
胜利不一定有希望但也不一定不可能。
2.
Whether he will come is uncertain.
他来不来还不一定。
3.
-I don't want to hear you say `Hard to say': What I want to hear is `I'm sure of it!'
—哎，维岳，‘不一定’，我不要听，我要的是‘一定’！
4.
Not necessarily, although some of them may for a long time to come.
不一定。有些是长期的，有些则不一定。
5.
The second round may not necessarily take one and a half months or teach the same things as the first one.
第二轮不一定搞一个半月，不一定还是那些内容。
6.
You needn't go yet,need you?
你不一定要去,是吗?
7.
We supposed he might not be at home.
我们想他不一定在家。
8.
I speak under correction.
我说的不一定都对。
9.
Gifts do not have to be objects.
礼物不一定要是物件。
10.
Successs is possible but hardly probable.
成功是可能的，但不一定。
11.
"He can't have got the fire to light ....
“一定是火烧不燃。… …
12.
"I'm perfectly certain Ah Ying won't be coming here tonight;
“阿英一定不来了！
13.
"Madam would never agree.
“太太一定不答应。
14.
Some pipes full of opium lay upon the table.
他决定一不做，二不休。
15.
I don't want to die - I won't die!"
我不肯死！我一定不能死
16.
B: I` m not sure, but I think he` s up to no good.
我不太确定，不过我想他一定不怀好意。
17.
This will make agreat picture.
这一张相片一定不错。
18.
I don't suppose one of 'em's a stiff named Harding?
我不确定是不是有一个叫做哈定的？