I believe it means, he destroyed the chance to make trades/sell. If there is only one thing to sell, and he's unwilling to sell it, that means he destroyed that one opportunity they had to do trade. Likewise, setting a store on fire would literally destroy the ability to make trades or purchases. This is just a guess. I've never heard that phrase before.

It has to do with expectations. If you're dealing with an expected outcome, use yet. If you're dealing with an unexpected outcome (or describing a continuous action), use still. "I thought the mailman would be late due to the snow, but my package still arrived on time!" "Though the expected arrival was today at 4:00, my package still hasn't arrived yet!" You see can that in the first sentence, still is used because the package arriving on time was unexpected due to the snow. However in the second sentence, it was expected that the package would arrive on time, as there was no reason it shouldn't have, so yet was used.

Their usage is almost the same. The only real difference is the fact that "tell" includes an indirect object. I said I wanted pizza. I told you I wanted pizza. Here, you can see how tell includes an indirect object in the sentence structure. Basically, while you can say something, you have to tell something to someone else.

I think a good phrase would be "cheer up!" or perhaps "keep it up!" "Cheer up" is good if say, a friend is looking dejected and you are trying to improve his mood. "Keep it up" is used in situations where someone needs motivation or encouragement to continue their current task.

It was unclear, but it sounds like she said "It's not even summer right now". Possibly referencing that they only go to Aunt Sara's in the summer? She definitely said "It's not even __ "

It was unclear, but it sounds like she said "It's not even summer right now". Possibly referencing that they only go to Aunt Sara's in the summer? She definitely said "It's not even __ "