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[quote="Vincent Tailors"]
Because if an action in the past occured after another action in the past, the latter must be past perfect and the former must be in past simple. Kind of. Right? Sequence...

I'd thought and thought about exactly that but couldn't make up my mind. :wall: Hey - gimme a minute, I'll go to the library and find a grammar textbook. Постараюсь.

I'm sorry! I don't know if it's technically wrong, it just sounded funny to me. Now that I think about it, it's probably fine.

Native English-speaker to the rescue! :)

First - ReDSanchous and Vincent Tailors are more-or-less right about "concrete". The dictionary examples are correct, there is that second meaning. But...