A compound sentence consists of two or more simple sentences called main clauses.

Simple Sentence	Simple Sentence
The Wright brothers built an airplane	They flew it successfully

Compound Sentence

The Wright brothers built an airplane, and they flew it successfully.

Connectives

1. Addition
 And, besides, moreover, in addition, furthermore.

•  I went to dinner after class,and later in the evening I went downtown to a movie.
• The lesson was not very interesting; besides, it was much too long.
• I’m not interested in seeing that movie; moreover, I have work to do.
• The student speaks English well; in addition, he seems to know a lot about our customs.
• The girl must know how to type; furthermore, she should have some knowledge of shorthand.
   

2. Contrast
But, yet, still, however, nevertheless, on the other hand.

• John was a good student in English, but he failed in mathematics.
• He understands English, yet he can’t speak it.
• He knows English; still, he doesn’t participate in class.
• I am getting along quite well; however, my roommate is not doing so well.
• Mary was sick; nevertheless, she came to class.
• This house is not very comfortable; on the other hand, it has an excellent location.

3. Alternative
Either-or, otherwise

• Either you must pay him this week, or he will call his lawyer. 
• You must stay; otherwise, he will be disappointed.
   

4. Consequence
So, therefore, as a result, for that reason, as a consequence

• The car broke down; so, they had to ride the bus.
• The tape recorder was not working properly; therefore, the recording was not very clear.
• The sergeant disobeyed the order; as a result, (as a consequence) he was punished.
   

5. Amplification
In fact, for instance, for example, as a matter of fact

• There was considerable turbulence; in fact, it was the worst I had ever experienced.
• The students are making excellent progress; for instance, they have begun to think in English.
• My friend speaks several languages; for example, he speaks French, Russian and German.
• It was hot yesterday; as a matter of fact, it was 100 degrees.

6. Substitution

• He didn’t go downtown; instead, he stayed home and studied.