求教UNLESS ~~~~~

Dianakisscat

刚才看了几篇帖子，
觉得自己一开始对unless 的认识似乎有问题，现在重新梳理一下

希望大家看看是不是正确的。

A unless B.  意思是B发生，A就不发生  A -- > neg B
例：I will go unless you go.     即“你去的话，我就不去了”  

you go -- > I will not go.    或者   I go -- > you will not go.



Not A unless B  意思除非B发生，A才发生  A -- > B
例：I will Not go unless you go.  除非你去，否则我是不会去的

I go -- > you go   或者you won't go -- > I won't go

B（you go）是A（I go）的必要条件，A -- > B
因为没有B就没有A(你不去，我就不会去)，但是有B也不一定有A（你去了，我也不一定去）



想请教一下大家，这样的理解是正确的吗？
A unless B.  意思是B发生，A就不发生  A -- > neg B
Not A unless B  意思除非B发生，A才发生  A -- > B

imstephanie

I think your understanding is correct.

Generally speaking, B determins A.
B is the condition that triggers A's happening.

If B happens, then A will happen. Positive or negative is not that important.:-)

sdcar2010

LZ, you got half right.

A unless B.  意思是B发生，A就不发生  A -- > neg B
Not A unless B  意思除非B发生，A才发生  A -- > B

The first is worng.
The second is right.

A unless B:  Not A --> B; or Not B --> A
Not A unless B: A--> B; or Not B --> Not A

sdcar2010

I think your understanding is correct.

Generally speaking, B determins A.
B is the condition that triggers A's happening.

If B happens, then A will happen. Positive or negative is not that important.:-)

-- by 会员 imstephanie (2011/3/23 11:07:36)

No hard feelings. But your statements are totally wrong in terms of logical reasoning. For one thing, positive and negative is very important. For another, B is never a trigger in XXX unless B.  NOT B is the trigger.

imstephanie

多谢楼上提点，刚才回答错误了，希望不要困扰到LZ。

Dianakisscat

LZ, you got half right.

A unless B.  意思是B发生，A就不发生  A -- > neg B
Not A unless B  意思除非B发生，A才发生  A -- > B

The first is worng.
The second is right.

A unless B:  Not A --> B; or Not B --> A
Not A unless B: A--> B; or Not B --> Not A

-- by 会员 sdcar2010 (2011/3/23 11:22:31)

能不能举例子解释一下
A unless B:  Not A --> B; or Not B --> A        ？？？


我也是今天搜索到一篇回帖，上面写着
A unless B ==> A --> neg B.
I will go unless you go ==> I will go --> you do not go (or you go --> I will not go).

这两个不是不一样吗？·····

sdcar2010

unless = if not

I will go unless you go  = If you are not going, I will go; or if I am not going, you will go. Basically, one of us will go but not both.

Dianakisscat

谢谢！