USING CONJUNCTIONS
Black Azar Units
Connecting Ideas
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Grammar
Grammar
Grammar
8
When should we use which conjunction?
Using and to combine sentences simply connects two sentences.  This connection has no special meaning.
Using but to combine sentences indicates that two ideas are opposing each other.  Therefore, either S¹ or S² must contain not. 
Using or to combine sentences indicates that there are two or more choices.
Using so to combine sentences means that S¹ caused S² to happen.
Using because indicates that S¹ caused S² to happen or that S² caused S¹ to happen.  Because must be placed in front of the cause.
Using even though/although indicates that something unexpected happened after the cause, which holds a meaning opposite of one's expectations.  It follows the same rules as because.
AND  OR
SO   BUT
Do NOT begin a sentence with and, but, or, & so.
SO Therefore, S + VP.

BUT
However, S + VP.

AND
In addition/Additionally, S + VP.

OR
Alternatively, S + VP.
Be careful to use aux/modals, not, and tense correctly with conjunctions.
It may be helpful to review the modal auxiliaries section in chapter 7.
AND
OR
BECAUSE
SO
BUT
BECAUSE
EVEN THOUGH
EVEN THOUGH
I didn't bring an umbrella even though it is raining.
Even though it is raining, I didn't bring an umbrella.
I brought an umbrella because it is raining.
It is raining, but I didn't bring an umbrella.
Because it is raining, I should bring an umbrella.
It is raining, so I brought an umbrella.
Should I bring an umbrella, or should I wear a raincoat?
It is raining, and I have to drive to school.
Fundamentals of English
Grammar

Unit 1
Present Time

Unit 2
Past Time

Unit 3
Future Time

Unit 4
Present Perfect & Past Perfect

Unit 5
Asking Questions

Unit 6
Nouns & Pronouns

Unit 7
Modal Auxiliaries

Unit 8
Connecting Ideas

Unit 9
Comparisons

Unit 10
Passive

Unit 11
Count/Noncount Nouns & Articles

Unit 12
Adjective Clauses

Unit 13
Gerunds & Infinitives

Unit 14
Noun Clauses