②表转折关系：but、only、while、when

I am not rich but I am very happy.
我不富有,但我很快乐.【】
Only in this way can we succeed.
只有用这种办法,我们才能成功.【】
While I like the color of the hat, I do not like its shape.
虽然我喜欢这顶帽子的颜色,但我不喜欢它的形状.【】
I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只带了十五元钱,可是我想买的那本书定价二十元.【】
These birds are very beautiful and therefore liked by many people.
这些鸟很美丽因而被人们喜欢.【】
Mum told him to go to bed early so he could get up early the next morning.
妈妈叫他早点上床睡觉,第二天早上好早点起床.【】
We must start early, for it will take two hours to drive to the airport.
我们得早点动身,因为开车去机场得花两个小时.【】
work hard and then you will succeed.努力干然后你就会成功.