True, its always good to know important dates about anything, especially if it could be on a test.
Answer:
Unimportant to a given topic.
Explanation:
According to the chart the prefix irr means not. Hence the "not" important ( relevant, the base of the word means important to a given topic)
2. They ought to have thought of that sooner.
3. Children, would you like me to make something special for dinner tonight?
4. Robert could have forgotten to post the letter.
5. Excuse me, could I have a look at your newspaper?
6. They weren't able to finish the exercise because they didn't have time.
7. Mobile phones must not be used on the plane.
8. Richard can't have stole your camera.
