'I'd'是'I had'或者'I would'的缩写形式。
When using it with the word 'rather' you are suggesting you would like to do or prefer one thing more than another. 当和'rather'这个词一起用的时候，是建议你想做某事或者相比其他的事情更喜欢另一件事。

Here are some examples: 这里有一些例子： 

"I'd rather talk about this later."

 我宁愿过后再讨论这件事。

"I'd like to eat at home than go get fast food."

 相比出去吃快餐我更喜欢在家里吃。

"I'd rather ski than snowboard."

 相比滑雪板我更喜欢滑雪。

"I'd rather stay late than come in early tomorrow."

 相比明天早点过来我更喜欢待晚一些。

"I'd rather handle the problem myself." 

我更喜欢自己解决问题。

"I had rather go home than stay out too late."

 相比在外面待的太晚我宁愿回家。

"I had rather listen to my parents or get in trouble."

 我宁愿听我父母的不然会有麻烦。

"I would rather exercise than sit on the couch all day."

 相比整天坐在沙发上我更喜欢做运动。

"I would rather complete my task early."

 我宁愿早点完成我的任务。

"I would rather know the answer."

 我宁愿知道答案。