Hi,

It's better to use the "Question" function on italki for your questions.  People who answer can have their answers chosen as the best answer.  Some of us take pride in knowing that our help is of value :)

The phrase "used to" can be used in a few ways:

1st Usage:
1) "used to":
a) I used to go to parties when I was younger.  b) We used to go to that restaurant a lot, but it's closed now.  
This usage of "used to" describes something in the past.  You can replace "used to" with the word "would", but you must also include a reference to the time when you use the word "would".
a) I would go to parties when I was younger.    b) We would go to that restaurant when it was open, but it's closed now.
If you don't include a reference to the time when using "would", then the meaning changes to a subjunctive meaning:
a) I would go to parties, but I'm not a very social person, so I won't go.  b) We would go to that restaurant, but we heard the food is bad, so we'll go to another restaurant.

If you ask a question, you can't use "would".  And, you use the word "did" or "didn't" before the phrase and drop the 'd' in the word "used".
a) Did you use to go to parties?  b) Didn't you use to like that restaurant?

2nd Usage:
2) "to be used to"  (has a tense of "to be" before the phrase)
This meaning is altogether different from #1 above

a) I am used to waiting in long lines at the grocery store.  b) she was used to the cold weather.  
These examples mean "accustomed", "in the habit", or "made familiar with".

3rd Usage:
"used to be"
There is one problem with #2 - the form of "to be" must be used in front of the phrase "used to".  If it is used after the phrase, then it has a different meaning which is similar to #1 - this is because it is not really "to be" when used after the phrase, but only "be"... but because it follows "used to"  (used to be)... it looks like we are using "to be" (but we're not).  Sorry if that is confusing.

Here are some examples where "be" is used after "used to".  You can think of these as being the fixed phrase "used to be".  You would never use "would" or any other form of "be" in this fixed phrase - it is always "used to be".

1) I used to be happy (but now I am sad).
2) He used to be our boss (but now he is not).  
3) She used to be funny (but now she has no sense of humor).

I hope that helps!  Good luck!