Englishfor English speakers
if
Preposition
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If is used in a condition:
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# When something will cause something else
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#: If it rains, I will get wet.
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# When a condition is not true
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#: I'd prefer it if you took your shoes off.
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# although
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#: He was a great friend, if a little strange.
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# When ... occurs (a programming statement).
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#: If A, then B, else C.
if
Subordinator
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If is used to report questions and things that are unknown.
She asked if they had arrived yet.
I don't know if I want to go or not.
if
Noun
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If is a conditional situation.
There are many ifs we need to consider before we start on the plan.
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
weather
Noun
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The weather in a place is the air temperature, the number of clouds, and the amount of wind and rain or snow.
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The weather conditions at the airport are bad. I don't think the plane will be able to fly.
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The radio says the hot summer weather is going to continue for a few more days.
weather
Verb
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To weather is to be changed by the effects of sun, wind, ice or rain.
The old house had weathered badly.
allow
Verb
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If you allow something, you let it happen; you say it's OK.
We were not allowed to enter the building.
I allow food in my car.