I can't drive a car, but I have a motorbike license.
我不会开汽车,但我有摩托车的驾驶执照。
I invited hime to come up, but he wouldn't.
我请他上来,但是他不肯。
It was not forced upon them by the survival competition; they could have caught and lived on prey without using poison, just as the thousands of non-poisonous snakes still do.