Verb agreement

Verb disagreement tends to happen either when people amend the subject (such as ‘colleague’ to ‘colleagues’) and not the verb (such as ‘makes’ to ‘make’) or when there’s a fairly long sentence and the writer loses sight of the subject at the beginning of it: ‘The Queen, with her ladies-in-waiting, guards and corgis, who get packed into a number of train carriages, go to Balmoral twice a year.’ Always check carefully for the agreement of the verb with the subject, particularly in long sentences.