Had better/ used to

Had betterWe 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.

Used to

'Used to do' is different from 'to be used to doing' and 'to get used to doing'
Used to do
We use 'used to' for something that happened regularly in the past but no longer happens.
• I used to smoke a packet a day but I stopped two years ago.
• Ben used to travel a lot in his job but now, since his promotion, he doesn't.
• I used to drive to work but now I take the bus.
We also use it for something that was true but no longer is.
• There used to be a cinema in the town but now there isn't.
• She used to have really long hair but she's had it all cut off.
• I didn't use to like him but now I do.
to be used to doing
We use 'to be used to doing' to say that something is normal, not unusual.
• I'm used to living on my own. I've done it for quite a long time.
• Hans has lived in England for over a year so he is used to driving on the left now.
• They've always lived in hot countries so they aren't used to the cold weather here.
to get used to doing
We use 'to get used to doing' to talk about the process of something becoming normal for us.
• I didn't understand the accent when I first moved here but I quickly got used to it.
• She has started working nights and is still getting used to sleeping during the day.
• I have always lived in the country but now I'm beginning to get used to living in the city.