[The_Bends]

Assuming we're talking online.

The most obvious is callig down quickly with a draw. Lots of people do this provided the bet is normal sized they ch/call instantly. People with a massive hand or just half a hand have to think more.

Less reliable is using the time it takes someone to check to you to decide whether to continuation bet. Usually an instant check means a bet will take the pot, again because people with a hand will think about betting for a second, even if they do eventually check.

But betting patterns are by far and away the best way to get reads, make notes on people who raise draws, people who make bluffs when shown weakness, people who will call pot sized bets with no odds, people who min bet with monster hands, people who min bet with draws and people who CR continuation bets.