Hello, I need to know WHAT TYPE of classical conditioning these are: AKA trace, delayed, simultaneous, or backward.

1.When you were a child, every time your Uncle visited your home he brought you a large gift. You now feel happy whenever you think of your Uncle.

2.Jim is trying to quit smoking. However, every time he sees a cigarette, he gets a craving to smoke.

3.Your dog cowers at the sight of lightning.

4.Your mouth starts to water whenever someone mentions sucking on a lemon.