主讲教师：林斌 北京八十中学英语特级教师
开篇语
虚拟语气
第三层次：
省略If的条件句 (Without/But for)
1) Without water, we would die.
—If we had no water, we would die.
2) Without your help, I would have failed in the exam yesterday.
—If you hadn’t helped me, I would have failed in the exam yesterday.
第四层次：
混合虚拟：
1) If I had studied hard before, I would get the good marks now.
2) If I had drunk enough water just now, I would not be thirsty now.
