In English, in is a very commonly used word that has many meanings and can be used in different contexts.
The meaning of in
In can mean "somewhere", for example: i am in the room(I'm in the room.) In can also mean "in a certain state", for example: he is in a good mood(He's in a good mood.) In can also mean "in a certain period of time", for example: the meeting is in two hours(The meeting is two hours later.) In can also mean "to some extent", for example: the price is in my budget(*Within my budget.) In can also mean "in a certain range", for example: the number is in the range of 10 to 20(The number is between 10 and 20.) In can also mean "in a certain situation", for example: in case of emergency, call 110(In case of emergency, call 110.) ）
Usage of in
In can be used as a preposition or as an adjective or adverb.
Usage of in as a preposition
When in means "somewhere", it can be followed by a noun, pronoun, or gerund. For example:
i am in the room.(I'm in the room.) ）
he is in my car.(He's in my car.) ）
what are you doing in the kitchen?(What are you doing in the kitchen?)）
When in means "in a certain state", it can be followed by a noun, adjective, or adverb. For example:
he is in a good mood.(He's in a good mood.) ）
the water is in a boiling state.(The water is boiling.) ）
the car is in the parking lot.(The car is in the parking lot.) ）
When in means "in a certain period of time", it can be followed by a noun, pronoun, or gerund. For example:
the meeting is in two hours.(The meeting is two hours later.) ）
i will be in beijing in two days.(I'll be in Beijing in two days.) ）
i am in a rush.(I'm in a hurry.) ）
When in means "to some extent", it can be followed by a noun, adjective, or adverb. For example:
the price is in my budget.(*Within my budget.) ）
the cake is in perfect condition.(The cake is intact.) ）
the meeting is in progress.(The meeting is ongoing. ）
When in means "within a certain range", it can be followed by a noun, adjective, or adverb. For example:
the number is in the range of 10 to 20.(The number is between 10 and 20.) ）
the temperature is in the high 20s.(The temperature is in the mid-20s.) ）
the cost is within our reach.(The cost is within our reach.) ）
When in means "in a certain situation", it can be followed by a noun, adjective, or adverb. For example:
in case of emergency, call 110.(In case of emergency, call 110.) ）
in the event of a fire, evacuate the building immediately.(In the event of a fire, evacuate the building immediately.) ）
in the absence of any evidence, we cannot make a judgment.(We can't make a judgment without any evidence.) ）
Example sentence for in
i am in the house.(I'm in the house.) ）
the cat is in the tree.(Cat in a tree.) ）
the ball is in the air.(The ball is in the air.) ）
the water is in the glass.(Water in a cup.) ）
the meeting is in the conference room.(The meeting was in a conference room.) ）
the price is in the range of $100 to $200.(*Between $100 and $200.) ）
Summary
In is a very commonly used word that has many meanings and can be used in different contexts. When using in, you need to pay attention to its specific meaning and usage to avoid mistakes.
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