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Hello Fred 1) 'in' can be used as a preposition as you mention. i.e: I am interested in grammar. 2) It can also be used as an adverb. i e: My husband is not in (Meaning my husband is not at home) 3) It can be used as an adjective. i e: I will wear an in dress on Sunday party. (meaning a nice dress according to current fashion) 4) It can also be used as a noun. i e. I don't know my neighbour's ins and outs (meaning someone's acts of going or coming. I hope this can be useful for you. 😊 Kind regards,
The word " in " can be also be used as an adverb. Example: Go in. We're locked in. in this usage it is telling you where the action is taking place. The word " in " can also be used as an adjective. Example: Dr. Smith is in. The teacher will be in shortly. in this usage it is usually about someone being present at their office or post. The work " in " can also be used informally. Example: Long nails are in. (meaning there are in style, current in fashion) Hope this helps.
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Start testIt can also be used as an Adverb. "Come in", here it has been used as an adverb qualifying a verb.