HAD BETTER

 We use “had better” plus the infinitive without “to”  to give advice. Although “had” is the past form of “have”, we use “had better” to give advice about the present or future.

• You'd better tell her everything.
• I'd better get back to work.
• We'd better meet early.

The negative form is “had better not”.

• You'd better not say anything.
• I'd better not come.
• We'd better not miss the start of his presentation.

We use “had better” to give advice about specific situations, not general ones. If you want to talk about general situations, you must use “should”.

• You should brush your teeth before you go to bed.
• I shouldn't listen to negative people.
• He should dress more appropriately for the office.

When we give advice about specific situations, it is also possible to use “should”.

• You shouldn't say anything.
• I should get back to work.
• We should meet early.

However, when we use “had better” there is a suggestion that if the advice is not followed, that something bad will happen.

• You'd better do what I say or else you will get into trouble.
• I'd better get back to work or my boss will be angry with me.
• We'd better get to the airport by five or else we may miss the flight

WE CAN SUMMARY IN THE FOLLOWING CHART:

Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
had better recommendation	1. SHIFT TO "SHOULD" OR "OUGHT TO" People should unplug toasters before they clean them. 2. SHIFT TO "SHOULD HAVE" OR "OUGHT TO HAVE" You should have unplugged the toaster before you tried to clean it. 3. You had better unplug the toaster before you try to clean it.	1. SHIFT TO "SHOULD" OR "OUGHT TO" People shouldn't clean toasters without unplugging them first. 2. SHIFT TO "SHOULD HAVE" OR "OUGHT TO HAVE" You shouldn't have cleaned the toaster without unplugging it first. 3. You had better not clean the toaster until you unplug it.	should, ought to
had better desperate hope, warning	The movie had better end soon. They had better be here before we start dinner. Desperate hopes and warnings usually refer to the near future.	They had better not be late. They had better not forget Tom's birthday gift. Desperate hopes and warnings usually refer to the near future.

 "Had better" is often simply pronounced as "better" in spoken English.