Commas
Use a comma after an introductory subordinate clause that comes before the main clause: "Although it was late, she stayed to finish the work." No comma is needed when the subordinate clause comes second: "She stayed to finish the work although it was late." For non-defining relative clauses, commas are required on both sides: "My brother, who lives in Berlin, is visiting next week."
Use a comma after an introductory subordinate clause that comes before the main clause: "Although it was late, she stayed to finish the work." No comma is needed when the subordinate clause comes second: "She stayed to finish the work although it was late." For non-defining relative clauses, commas are required on both sides: "My brother, who lives in Berlin, is visiting next week."
Practice
Which sentence is correctly punctuated?
My colleaguewho has worked here for 20 years
Put the words in the correct order: