Grammatically Correct:
* Prepositions used to show different relationships:
* "The book is on the table in the living room." (Here, "on" shows the book's position relative to the table, and "in" shows the table's location in the room.)
* Prepositional phrases modifying different parts of the sentence:
* "He walked through the forest after the rain." ("Through the forest" modifies "walked," and "after the rain" modifies "walked" as well.)
Stylistically Questionable:
* Redundant use:
* "He went into the house inside." ("Inside" is unnecessary, as "into" already implies entering the house.)
* "She looked up at the sky above." ("Above" is redundant with "up at".)
How to use prepositions twice effectively:
* Clarity: Ensure both prepositions contribute to the meaning of the sentence and are not redundant.
* Natural flow: Avoid using prepositions that sound awkward or forced together.
Example of a sentence with two prepositions used effectively:
* "I found the key under the rug by the fireplace."
Example of a sentence with two prepositions that sounds awkward:
* "She walked into the room inside."
Ultimately, whether or not using two prepositions in a sentence is grammatically correct depends on the specific context. However, it's always best to strive for clarity and natural flow in your writing.