Do you Use commas around an idea that interrupts a sentence?

Yes, you use commas around an idea that interrupts a sentence. This is called a parenthetical phrase.

Here's how it works:

* Interruptive phrase: A phrase that adds extra information to the sentence but isn't essential to its meaning.

* Commas: Used to separate the interruptive phrase from the rest of the sentence.

Example:

* "The cat, which was very fluffy, sat on the windowsill."

Here, "which was very fluffy" is the interruptive phrase. It describes the cat, but the sentence would still make sense without it.

Here are some other examples of parenthetical phrases:

* "The dog, a golden retriever, barked at the mailman."

* "I went to the store, but I forgot to buy milk.**"

* "We went to the beach, and it was beautiful.**"

Note: If the interruptive phrase is very short (just a few words), you might not need commas.

* "The dog, a golden retriever, barked."

* "The dog a golden retriever barked." (Both are grammatically correct.)

However, it's generally safer to use commas to avoid confusion.