all or none

例句：

1. 1. If the weather is good, we can go for a picnic.
   如果天气好的话，我们可以去野餐。
2. 2. We need to decide whether to accept the offer or not.
   我们需要决定是否接受这个提议。
3. 3. He had to choose between all or none of his friends.
   他必须选择他的一个朋友，或者一个都没有。