第1个回答 2006-07-14
you ought to tell your dad not to smoke,because smoking is harmful to your father's health.本回答被提问者采纳
第2个回答 2006-07-14
you should tell your father not to smoke,for smoke is harmful to your father's health.
第3个回答 2006-07-14
you should tell your father not to smoke because smoking does harm to his health