1.The bridge will be finished by the end of 2015.( by+未来时间,用将来完成时）
2.The singer has been suffering from a bad cold these days.（these days,用现在完成时）
3.There is nothing wrong with you and that boy being friends and studying together.（with+人+Ving结构）
4.You can do the homework by discussing with classmates.（by为介词,后加动词的ing形式）
5.Anne has been crazy about nature all her life.（all one's life与现在完成时连用）第一题老师给的答案是will have being finished( ⊙ o ⊙ )啊！…二 …………………… has being suffered……………………大家的答案很多都不同，求答案~~~~(>_<)~~~~你们老师给的答案有错，have 后在只可能有have done/have been done/have been doing的结构，怎么会有have doing的呢？doing前一般用be的某种形式谢谢，还有The singer has been suffering ，suffer为什么要用ing啊？不好意思,这是现在完成进行时,基本形式为have been doing,昨天才少 打了"进行"