water is very essential for human beings保持原句意思Water is very ------- ------- human beings

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• 初二英语书面表达 请各位帮帮忙,1.按实际情况回答下面的问题.（1） Why water is so important to people? (2) Is all the water drinkable in the world? (3) In what ways are people polluting the water? (4) What can we do to protect the water? (5) As a student, what can you do to save water?2. 将你的答案连成句子,并写成文章. Water is very important for human beings, because________________________________________________________________________________________________________________________
• 按要求改写句子：（1）Take an escalator when there is a fire.（改成否定句）（2）I want to sell raisin scones.（保持原句意思不变）（3）A bath can easily use （225 liters of）water.（对括号部分提问）（4）The little duck looks very funny.（改为感叹句）（5）I heard from my parents yesterday.（改为一般疑问句）
• water is very essential for human beings
• water is very essential for human beings保持原句意思Water is very ------- ------- human beings
• human 与 human beings 的不同是什么呀?
• 关于human beings的问题human beings是可数还是不可数?"s"能去掉吗?后面的动词用单数还是复数?