For: "I went to the store, for I needed to buy milk and bread."
And: "I went to the store, and I bought milk and bread."
Nor: "I did not go to the store, nor did I do the dishes."
But: "I like pizza, but my sister prefers tacos."
Or: "She can come to the party, or she can stay home."
Yet: "I finished my homework, yet I still have to study for my test."
So: "I am tired, so I will go to bed early."