A conjunction may be used to indicate the relationship between the ideas expressed in a clause and the ideas expressed in the rest of a sentence.

I went to the beach because it was sunny

Most commonly used conjunctions and, or and but.

Coordinate conjunctions

and:  in addition

but:  however

or:  alternatively

nor:  and neither

yet:  however

• He went and had a burger.


• He did the exam but failed.


• Do you want to go to the park or stay at home?

Subordinate Conjunctions

As

1. because:  As he is my friend, I will help him.

2. when:  We watched as the plane took off.

After

1. later in time:  After the train left, we went home.

Although or though

1. in spite of the fact that:  Although it was after midnight, we did not feel tired.

Before

1. earlier than:  I arrived before the stores were open.

Because

1. for the reason that:  We had to wait, because we arrived early.

Since

1. from a past time:  I have been here since the sun rose.

2. as, because:  Since you are here, you can help me.

Than

1. used in comparisons:  He is taller than you are.

Unless

1. except when, if not:  Unless he helps us, we cannot succeed.

Until or till

1. up to the time when:  I will wait until I hear from you.

Whether

1. if:  I do not know whether she was invited.

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