This is the earth. The green part is land. The blue part is sea. The white part is clouds. Our earth is very beautiful and interesting. There are rivers, streams, seas and lakes. There are hills and mountains. There are woods, jungles and forests. There are many countries and cities. There are many people live in them. Do you think the earth is very wonderful?
Many years ago, the earth is very clean. But nowadays there is much pollution on the earth. There is air pollution, land pollution and water pollution。People are cutting down the forests.
Many wild animals, birds and insects lose their homes. People are killing animals for their food and their skins. It’s very cruel. People are polluting the land, the water and the air. People must stop doing this. We must save the earth.
牛津实用英语语法:147 need not,must not和 must
牛津实用英语语法:165 拼写
牛津实用英语语法:157 must与may/might的比较
牛津实用英语语法:144 must和have to的各种形式
牛津实用英语语法:140 should的各种形式
牛津实用英语语法:173用来表示习惯性动作
牛津实用英语语法:179过去式主要用法
牛津实用英语语法:139 ought的各种形式
牛津实用英语语法:152 needn't+完成式
牛津实用英语语法:190 现在完成进行时形式
牛津实用英语语法:175形式
牛津实用英语语法:166 用法
牛津实用英语语法:170 see和 hear
牛津实用英语语法:111 附加评论
牛津实用英语语法:176不规则动词
牛津实用英语语法:194 过去完成时形式和用法
牛津实用英语语法:141 ought/should与must和 have to的比较
牛津实用英语语法:168 通常不用于进行时的动词
牛津实用英语语法:181过去进行时替代一般过去时的用法
牛津实用英语语法:149 表示无义务的各种形式
牛津实用英语语法:164 现在进行时形式
牛津实用英语语法:154 needn't,could和should+完成式
牛津实用英语语法:145 肯定句中 must和 have to的区别
牛津实用英语语法:180过去式其他用法
牛津实用英语语法:167 其他可能的用法
牛津实用英语语法:202 现在进行时用来表示将来
牛津实用英语语法:160 will和should表示假设
牛津实用英语语法:172一般现在时形式
牛津实用英语语法:148 need 的各种形式
牛津实用英语语法:162 used
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