句型：We must save the trees and not buy things made of ivory.为什么buy前用了not,而不是don‘t ,made用过去式?

反义疑问句习题We must save the Earth.We must save the Earth,______,_______? 改反意疑问句We must save the Earth.We must save the Earth,___ ___? we must save the ___________animals in the world（danger） 请问“we must help save the earth”中的help The animals are in d_ .We must save them. 句型：We must save the trees and not buy things made of ivory.为什么buy前用了not,而不是don‘t ,made用过去式? we must do what we could___(save) the person who is in need we must save our earth作文 This year we must strive to make money ,save money ,fight for the future we must save the trees and not buy things made of ivory we must save the trees and not buy things made of ivory意思 we should save the sick free from pain句型转换:we should _____ the sick ______ pain.还有,看不懂. 改错题：we should keep in mind the necessity that every person must save the energy resources.we should keep in mind the necessity that every person must save the energy resources为什么要把must改成should? save ,the,we,trees ,must,ivory,made of,thingssave ,the,we,trees ,must,ivory,made of,things,not ,buy,and（连词成句） 九年级英语题（句型转换）2.We must save water in our daily life.Water must _____ ______ in our daily life3.The foreigners want to konw how they can learn Chinese Kungfu wellThe foreigners want to konw____ _____ learn Chinese Kungfu well4.M We must study hard做句型转换 we must wear_______(save)belt in a car we must call the