1. He is standing at the back of the shop.

2. He is standing behind the shop.

3. He is standing in back of the shop.

4. He is standing in the back of the shop.

5. He is standing at back of the shop.

(Are they all grammatical? Which one is ungrammatical? Do they have the same meaning?)

1 answer

1 - 4 are fine. 5 is not correct.

1 and 4 mean the same thing: He is inside the shop, but standing in the back.

2 and 3 mean the same thing: He is standing outside the back of the shop.