Examples

Example 1

If I were in a position to affect real change in this world, I would start by instituting mandatory naptime for people of all ages.

Who ever said you stop getting tired in the middle of the day after kindergarten? In this sleepy sentence, affect is a verb that means the same as influence.

Example 2

Recalling my girlfriend's affect over the past two weeks, I think our "talk" this afternoon is going to be more like a train wreck.

It's not him, it's her. Here, affect is used as a noun that refers to the girlfriend's feelings.

Example 3

Until Duke tried the Thai drunken noodles at SriPraPhai, he thought that spicy food had no effect on his digestion.

We already feel bad for Duke's roommates. In this sentence, effect is a noun that refers to digestive issues caused by the offending noodles. Stick with the Pad Thai next time, Duke.