Question

the bold word is a \front swabi\ (subordinating conjunction). does the highlighted comma belong?
since felonious grus ankle is bothering him , we should take it easy today.
keep the comma
remove the comma

Explanation:

When a subordinating conjunction (like "Since") starts a sentence and introduces a dependent clause, a comma is required to separate the dependent clause from the independent main clause that follows. Here, "Since Felonious Gru's ankle is bothering him" is the dependent clause, and "we should take it easy today" is the independent clause, so the comma is grammatically correct.

Answer:

Keep the Comma