1. You might hear, "Delta Oscar Golf, number two behind the Cherokee on base." If you hear, "Charlie Alfa Tango, number one" the controller is probably going to clear someone to take off before you, or allow someone to cross the runway. If there is no one in front of you, and no one else using the runway, you will probably get landing clearance.

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2. You already got that information from the ATIS before you entered the control zone, and the controller would have updated it with your initial clearance to join downwind.

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3. They will tell you who you are following, but you have to listen out to figure out who else is around.

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4. You MIGHT get landing clearance on downwind. You might not get it until short final.