So I found a few of sentences like these ones :
1. I washed and washed as much as I could, but the paint began to harden.
2. So we took as much as we could and headed out.
3. When I was a child, I would learn as much as I could about my pets.
So I just wanted to know what kind of meaning "could" has. Does "could" have conditional meaning with some unstated if-clause. Or does it simply relate to ability that someone had in the past? If it's an ability then I'm confused. Because there's a rule stating that we can't use could when talking about some certain particular past situation and we should use "was, were able to/managed to/etc instead. So sentences 2 and 1 are about particular past situations and sentence 3 is something like what a person always did in the past. So "could vs. was able to" rule doesn't work in here.
Could you help me out?
DVBC 1. I washed and washed as much as I could, but the paint began to harden. [= as much as I was able to wash] 2.
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DVBC1. I washed and washed as much as I could, but the paint began to harden. [= as much as I was able to wash]
2. So we took as much as we could and headed out. [= as much as we were able to take]
3. When I was a child, I would learn as much as I could about my pets.