Whats the difference between tomorrows meeting and meeting . . . The first sentence is not correct It should be "I have to attend tomorrow's meeting" "The" is normally used to indicate a specific item, for example, "the meeting" refers to a particular meeting, while "a meeting" is just any meeting Since the meeting is already singled out by it being "tomorrow's" meeting, using "the" is incorrect Additionally, the second sentence can have two slightly