- When "in" introduces an essential phrase or clause that provides crucial information:
Example: They found the treasure, in the attic, wrapped in a dusty cloth.
- When "in" is part of a transitional expression connecting two related thoughts:
Example: In conclusion, the project was a complete success.
- To separate multiple "in" phrases or clauses to enhance readability:
Example: The team visited Paris, in France; Berlin, in Germany; and Rome, in Italy.
Omit a comma before an "in" sentence:
- When "in" is part of a prepositional phrase closely tied to the verb or adjective it modifies:
Example: The box was placed in the corner of the room.
The student is proficient in Mathematics.
- When "in" introduces an expected and non-restrictive phrase or clause:
Example: The house in the suburbs was finally sold. (Assuming the context has already mentioned a house in the suburbs.)
- With brief and basic "in" phrases that simply provide additional details:
Example: I saw her in the park.
The plane landed in Chicago.
Remembering these guidelines will help you punctuate "in" sentences effectively and enhance your writing clarity.