In
my experience, Paul, many students have difficulty with the correct
usage of used to, so it may be useful to spend a little time
looking at this.
It
refers to past habits and states. If we say that somebody used to
do something, we mean that some time ago he was in the habit of doing
this, but he no longer does it now. Here are some examples:
'I used to smoke 30 cigarettes a day, but I gave up when
I became convinced that smoking causes cancer.'
'I didn't use to like cricket, but now I'm getting interested
in it.'
'Didn't he use to be vegetarian?' 'Yes, he did, but he
started eating meat last winter and now he's a real carnivore.'
Past
simple, on the other hand, describes something which happened at a
definite point in time in the past. Thus:
'I bought one of Lady Di's dresses at an auction in Boston.'
'When did you meet your husband?' 'I met
him in 1992, but we didn't get married until quite recently.'