1.“(Must )I come at 6 o’clock?”“Oh no,you needn’t."
2.A blind man (can't)judge colours.
3."May I go there?'' “No,You (needn't )"
4.Two eyes ( can ) see more than one.
5.I (must)be off.Thank you very much for supper.
6.You (must )be careful.You ( )be careless.
7.(can )I stay up till midnight,please?
8.The teacher (can't )favour som children more than others