Question

1. He is working in the building.
2. He is working at the building.
[Is #2 wrong? Can we use 'at' in the sentence?]

3. The boy is waiting for me in the bathroom.
4. The boy is waiting for me at the bathroom.
5. The boy is waiting for me by the bathroom.
[Is #4 wrong? Or does #4 mean #5?]

6. He is watching TV in the living room.
7. He is watching TV at the living room.
[Can't we use 'at' here?]

8. She is cooking in the kitchen.
9. She is cooking at the kitchen.
[Can't we use 'at' here?]

Answer 1

1. He is working in the building.
2. He is working at the building.
[Is #2 wrong? Can we use 'at' in the sentence?] <b>Both can be used, but they may or may not mean the same thing. 1 means he works INSIDE the building. 2 can mean he works inside or outside the building.</b>

3. The boy is waiting for me in the bathroom.
4. The boy is waiting for me at the bathroom.
5. The boy is waiting for me by the bathroom.
[Is #4 wrong? Or does #4 mean #5?] <b>Again, "in" in 3 means inside. 4 and 5 mean he's waiting just outside or near the bathroom door.</b>

6. He is watching TV in the living room.
7. He is watching TV at the living room.
[Can't we use 'at' here?] <b>No, 7 is incorrect.</b>

8. She is cooking in the kitchen.
9. She is cooking at the kitchen.
[Can't we use 'at' here?] <b>No, 9 is incorrect unless you mean an outdoor kitchen. If it's an outdoor kitchen, "at" might work, but not for a kitchen inside the house.</b>

Answer 2

Thank you so much.