but (tegenstelling met vorige zin)
I have to write a report. Our computer is broken.
I have to write a report, but our computer is broken.
and (toevoeging aan vorig zin)
Sofie likes to use Instagram. She uses Snapchat.
Sofie likes to use Instagram and she uses Snapchat.
because (reden van vorige zin)
I bought a new phone. I dropped my old phone on the floor.
I bought a new phone because I dropped my old phone on the floor.