I could learn lots of things
I could enjoy my trip overseas
I could make a good friend
COULD = WAS ABLE TO
The most common use of ‘could’ is when we talk about something that MIGHT happen (but has not happened yet), IF some condition is present
If I went overseas I could learn lots of things
If didn’t have to worry so much about money, I could enjoy my trip overseas.
If I got to know some new people, maybe I could make a good friend
In other words, all three sentences
I could learn lots of things
I could enjoy my trip overseas
I could make a good friend
are good sentences, but ONLY WHEN you want to say something that is only a possibility.
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However, when you are just describing something that happened, DON’T use ‘could’, use SIMPLE PAST:
I learnED lots of things
I enjoyED my trip overseas
I maDE a good friend
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(There are other uses of ‘could’ but this rule is a pretty good one for the most common errors)
