1

A and B are going to take a bomb-defusing class tomorrow.

A: I am going to dominate that class. You don't cross-stitch for 20 years without developing a steady hand.

B: Wow, you really think that is a brag, don't you? 20 bucks says, I do better in that class than you do.

A: All right, you're on.


C is super drunk and A is offering to sober her up.

A: I got this. I'm a master at sobering up.

B: Are you sure?

A: Uh, you don't go to the Renaissance Faire every weekend in your 20s without learning how to handle your mead.

B: Great. Thanks, C

I hardly understand what these marked sentences mean. I definitely don't understand the construction, though. Why do they use "don't" here, not "didn't" or "haven't" ?

Those dialogues was taken from an sitcom.

2

Don't because they are general, timeless statements, for which we usually use the the present simple. "You" is here an indefinite pronoun, not the second person (addressee).

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