1 I can play football very well. 2 You must study well if you want to have good marks. 3 You should read more about this topic.4 I could help you if you were here. 5 May i go out? 6 You needn't go there! 7 He can do it hinself 8 He said that she might know the truth 9 You ought to be more careful about your health 10 You needn't come so early 11 He ought not to cook the dinner himself