Englishfor English speakers
for
Preposition
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shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
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For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
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For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.
oral
Adjective
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Oral history, arguments, etc. are spoken, not written.
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Oral sex is sex using the mouth.
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Oral health, cancer, etc. is issues of the mouth.
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Oral medicine is medicine you put in your mouth and swallow.