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3 Clarified based on CarSmack's feedback
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I would use "at" withwhen referring to a destination. The personlocation, like "the airport", "the bus stop", or thing"school". In my mind, it is or was in the general area of thata specific place I can go to, butalthough that may not beapply to every context.

"I'm going to the bus stop. I'm at the bus stop. I have walked to the bus that is stopped at the bus stop, and I am at the bus waiting for the doors to open."

"Where is she?"

"She is at the park."

"I'm at the park, and I don't see her."

"It's a big park. She is probably in the park somewhere."

The park is a location that both people in the conversation above know how to get to. "In the park" is somewhere inside the boundaries at thisof the park, but isn't a location you could give someone exact momentdirections to like "the park on Elm street".

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I bought the lamp while I was inside the store, but what the person asking the question wants to know is the location.

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "I parked at the airport in lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove somewhere inside the airport, so I use in.

"Where did you find your missing glove?" "I had dropped it in the airport."

"Where is your glove?" "I think I lost it at the airport."

I know I had my glove before leaving the airport, and I noticed it was missing after I left the airport, so it is at that general location, but I don't know if it is inside the airport or lying on the sidewalk outside the airport.

I would use "at" with a destination. The person or thing is or was in the general area of that place, but may not be inside the boundaries at this exact moment.

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "I parked in lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove, so I use in.

"Where did you find your missing glove? "I had dropped it in the airport."

I would use "at" when referring to a location, like "the airport", "the bus stop", or "school". In my mind, it is a specific place I can go to, although that may not apply to every context.

"I'm going to the bus stop. I'm at the bus stop. I have walked to the bus that is stopped at the bus stop, and I am at the bus waiting for the doors to open."

"Where is she?"

"She is at the park."

"I'm at the park, and I don't see her."

"It's a big park. She is probably in the park somewhere."

The park is a location that both people in the conversation above know how to get to. "In the park" is somewhere inside the boundaries of the park, but isn't a location you could give someone exact directions to like "the park on Elm street".

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I bought the lamp while I was inside the store, but what the person asking the question wants to know is the location.

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "I parked at the airport in lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove somewhere inside the airport, so I use in.

"Where did you find your missing glove?" "I had dropped it in the airport."

"Where is your glove?" "I think I lost it at the airport."

I know I had my glove before leaving the airport, and I noticed it was missing after I left the airport, so it is at that general location, but I don't know if it is inside the airport or lying on the sidewalk outside the airport.

2 Made an example simpler
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I would use "at" with a destination. The person or thing is or was in the general area of that place, but may not be inside the boundaries at this exact moment.

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "My car is"I parked in parking lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove, so I use in.

"Where did you find your missing glove? "I had dropped it in the airport."

I would use "at" with a destination. The person or thing is or was in the general area of that place, but may not be inside the boundaries at this exact moment.

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "My car is in parking lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove, so I use in.

"Where did you find your missing glove? "I had dropped it in the airport."

I would use "at" with a destination. The person or thing is or was in the general area of that place, but may not be inside the boundaries at this exact moment.

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "I parked in lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove, so I use in.

"Where did you find your missing glove? "I had dropped it in the airport."

1
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I would use "at" with a destination. The person or thing is or was in the general area of that place, but may not be inside the boundaries at this exact moment.

"Where is Dad?" "He went to go grocery shopping, so he's at the market."

In this sentence, I bought the lamp while I was inside the store, but what the person asking the question wants to know is the destination or location.

"Where did you find that lamp?" "I bought it at the antiques store on main street."

I would use "in" with a place that has boundaries that I know the person or thing is inside.

"Where did you park?" "My car is in parking lot G."
"Where is your brother?" "He's in the arcade over there. He got bored waiting for you."

In this sentence, even though I'm not currently in the airport, I was at the time that I dropped my glove, so I use in.

"Where did you find your missing glove? "I had dropped it in the airport."