Here you are giving an example of what decision YOU would do given the circumstances. This can be in past tense or in a conditional present.

在这里，你给出了一个例子，根据情况你会做出什么决定，这可以用在过去时态，或在一定条件的现在。

Here are some examples: 这里有一些例子: 

"If I were you, I would enjoy my vacation."

 如果我是你的话，我会享受我的假期。

"If I were you, I would explain what happened."

 如果我是你的话，我会解释发生了什么。

"If I were you, I would continue working until it is done."

 如果我是你的话，我会继续工作直到把它完成。

"If I were you, I would book my reservations now."

 如果我是你的话，我会现在预订。

"If I were you, I would answer the question."

 如果我是你的话，我会回答这个问题。

By adding 'have' after the word 'would' you are talking about something in the past tense. 通过在'would'后面加'have'你是在谈论发生在过去时态的事情。

Here are some examples: 这里有一些例子: 

"If I were you, I would have enjoyed my vacation."

 如果我是你的话，我会享受我的假期。

"If I were you, I would have explained what happened."

 如果我是你的话，我会解释发生了什么。

"If I were you, I would have continued working until it was done."

 如果我是你的话，我会继续工作直到把它完成。

"If I were you, I would have booked my reservations now."

 如果我是你的话，我现在已经预订了。

"If I were you, I would have answered the question."

 如果我是你的话，我会回答这个问题。