Commas

Harold is an excellent singer and he can dance all of the latest dance moves.

• Insert comma before the conjunction (,and)
• Insert comma after the conjunction (and,)
• No comma needed

Nobody knows Harold can dance because he refuses to dance in public.

• Insert comma before the subordinator
• BInsert comma after the subordinator
• nsert comma after the word refuses
• No comma needed

Harold is going to the prom with Kendra or Olivia.

• nsert comma after the word prom
• Insert comma before the conjunction
• Insert comma after the conjunction
• No comma needed

Where does the comma belong? Sinking down in her chair my mother looked exhausted.

• Sinking down, in her
• down in her chair, my mother
• my mother, looked