Would you put a comma before after all .?

The answer depends on the context of the sentence. Here's a breakdown:

1. "After all" as a phrase introducing a new idea:

* Yes, use a comma. This happens when "after all" introduces a new thought or argument.

* Example: "I don't want to go to the party, but after all, it's my friend's birthday."

2. "After all" as a concluding phrase:

* No comma needed. This happens when "after all" summarizes or concludes a previous idea.

* Example: "It was a difficult journey, but we made it after all."

In short, consider the role of "after all" in your sentence. If it introduces a new thought, use a comma. If it concludes a thought, no comma is needed.