We use SO to explain a consequence.

•    It was cold so I opened the window. 

We use AND to join two similar ideas.

•    Manu lives in Palma and studies at IES Ramon Llull.

We use BUT to contrast ideas.

•    I am from Palma, but my best friend is from Quito.

We use OR to join alternatives.

•   We can go to the cinema or stay at home and watch Tv.

We use BECAUSE to show the cause.

•  We were late because we missed the bus.