... có thể xảy ra (probable conditions)Trong mệnh đề If loại 1, mệnh đề chính thường ở thì hiện tại, tương lai, hoặc thể mệnh lệnh.Mệnh đề IF Mệnh đề chínhSimple present FuturePresentImperative1. ... Tower for the Paris World’s Fair of 188 9.3. Miss Lan was doing that work at 10 a.m yesterday.4. They will recycle the waste paper in a local factory.5. By this time next year, Hong will have ... do) their homework. They (sleep) 8. Kim usually (go) to school by bike. But today she (walk) to school.9. Last week the doctor (fill) a cavity in my eighth tooth. 10. Next month, my English teacher...