两个人的,你可以加一个DadMother:Oh,my baby,look at your hands!So muddy!Do wash your hands with water.Boy:OK,Mom,but i don't know where is the water.Mother:Oh,no,Why you are so naughty,just go to kitchen or washroom.Boy:Mum,I have cleaned my hands already.Mother:All right.You should wash your hand once dirty from now on.Boy:I've got it!I just remember water to remind myself.Mother:It sounds good!.....What's the sound?Boy:Sound?Sorry,Mum,I donot know what you mean.Mother:Just like raining,oh,have you turned off the water faucet?Boy:What a pity!It is my fault since i forget to shut the water.Mother:Never waste water,you know water is the essence of life.since nearly 75 % of the earth's surface is covered with water. But about 97% of this huge amount is sea water, or salt water. Man can only drink and use the other 3% -- the fresh water that comes from rivers, lakes and others.Boy:i will save the water in the future.Mother:You know when you are saving the water,you are becoming rich,since everyone should form the habit of thriftiness.Boy:Habit is the second nature.I will correct bad habits.Water is simple but invaluable.Thank you Mom.望采纳!!