虚拟语气：
Ⅰ.三种不同时态的虚拟条件句
1. If I were you , I would attend the party. (现在)
2. I you had taken my advice , you wouldn’t have failed . （过去）
3. If you came / were to come / should come tomorrow , I would meet you at the airport. （将来）
4. If you had followed my advice (过去), you would feel better now（现在）（错综条件虚拟）
