Modal Verbs for Advice

Modal Verbs are used to give advice or suggestions.  There
are two modal verbs used for advice:  Should and Would.
Should
Should is used for advice in the present.  The structure is as
follows:

Subject  +  Should  +  Base Verb

• You should eat healthy food.
  
• You should exercise every day.
  

Should is used for advice in the past.  
Here is the structure:

Should + Have + Past Participle

• You should have gone to the party.
  
• She should have studied more often.
  

It is common to use "should" to give negative advice.  In this case, add "not".

• You should not smoke.
  
• You should not eat too much candy.
  

The contraction is "shouldn't".

• You shouldn't drive too fast.
  

Would 
The modal verb "would" is used to give advice.  In this situation, the speaker is giving hypothetical advice as if he/she were the listener.  Here are some examples:

• If I were you, I would return the book.
  
• If I were you, I would not wear that jacket.
  

It is not always necessary to include "If I were you".

• I wouldn't eat that.
  
• I would choose the red shoes.
  

Normally, would is used to talk about yourself, and should is used to talk about someone else.

Example:

• I would study tonight if I were you.
  
• You should study tonight.
  

It is also common to ask for advice using these modal verbs:

• What should I do?
  
• What would you do?