Expressing a specific condition for an outcome
If / Unless
| IF | UNLESS | ||
|---|---|---|---|
If introduces a clause with a condition (one of many) to achieve a specific outcome. The (dependent) clause may be placed before or after the the main (independent) clause.
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Unless (if...not) introduces a (dependent) clause with a condition that is an exception to achieving the outcome in the main clause.
| ||
OUTCOME
You will have a tender turkey.
|
IF
if you cook it slowly
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OUTCOME
You will have a tender turkey
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EXCEPT IF / IF NOT
unless you overcook it.
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You will have a tough turkey.
|
if you overcook it
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You will have a tough turkey
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unless you cook it slowly.
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We'll arrive at 8:00.
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if our train is on time
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We'll arrive at 8:00
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unless our train is late.
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We'll bring some champagne.
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if you wish.
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We'll bring some champagne.
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unless you object.
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SOURCE: www.grammar-quizzes.com/9-7.html
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