练习材料：
Lesson19 Sold out
'The play may begin at any moment,' I said.
'It may have begun already,' Susan answered.
I hurried to the ticket-office. 'May I have two tickets please ?' I asked.
'I'm sorry, we've sold out,' the girl said.
'What a pity!' Susan exclaimed.
Just then, a man hurried to the ticket-office.
'Can I return these two tickets?' he asked.
'Certainly,' the girl said.
I went back to the ticket-office at once.
'Could I have those two tickets please ?' I asked.
'Certainly, 'the girl said, 'but they are for next Wednesday's performance. Do you still want them?
'I might as well have them,' I said sadly.
任务配置:L0+L4
练习感悟：今天这篇课文是和买票有关，有两句话长得比较像，一个是the play may begin at any moment，剧马上就要开演了和It may have begun already可能已经开始了。第二句话与上一句话的区别在于它指的是可能【已经】发生的事情，所以用的是may加动词的完成时结构。以前没有注意到这么细的地方，值得学习。
