Yes, the sentence "My father was a hard working man but didn't earn much money." is correctly punctuated. The sentence is a simple statement and uses a comma to separate the two independent clauses "My father was a hard working man" and "didn't earn much money." The conjunction "but" connects the two clauses to show a contrast in the ideas presented.
Yes, the sentence "My father was a hard working man but didn't earn much money." is correctly punctuated. It includes a capital letter to begin the sentence, appropriate spacing between words, and a period at the end of the sentence to indicate its completion.
