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We use words called conjunctions, like and, or, but, because and although, to join two parts of sentences. Conjunctions can be used to give more information, give alternatives, give reasons, give results or give unexpected information.

We use and, or and but to connect two parts of sentences which are similar in grammatical status.

Do you want chocolate, strawberry or vanilla? (joining words)
Amy's dad is taking us on Saturday morning, and he's offered to bring us home again on Sunday. (joining clauses)

We use and  for adding information, or for giving alternatives and but for unexpected or different information. 

I'm OK for food, dance  and  music, and I'm having a wonderful time.
There's a reggae band from Jamaica or a Russian electro-pop group on the other stage.
She’d like to go but she can’t.

- See more at: http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/conjunctions-and-or-so-because-and-although#sthash.jpna3arC.dpuf

VIDEO explaining connectors

EXAMPLES of A2 writing tasks

Practice connectors 1
Practice connectors 2