AND

1. AND • It is used to join two similar ideas together. The subject can be omitted when it is the same as in the previous sentence. • Ex:He was born in London and (he) has lived there all his life.

2. BUT • It is used to join two contrasting ideas. • Ex:My father is Spanish, but my mother is French. The subject can also be omitted if it is the same as in the previous sentence. • Ex :I like the cinema, but don´t often go.

3. OR • It is used to join two alternative ideas. • Ex: I can lend you my dictionary, or you can buy one. • When the subject is the same in both sentences we can omit it. • Ex:I’d like to watch a film or listen to music.

4. SO  It is used to show that the second idea is the result of the first. • Ex: The boy was very tired, so he went straight to bed. • We don´t omit the subject in the second sentence even if it is the same as in the previous one.

5. BECAUSE • It is used to give the reason of something. • Ex: We didn’t go swimming because the water was dirty. • We can use because at the beginning. • Ex:Because the water was dirty, we didn’t go swimming.