1."The play may begin at any moment," I said."It may have begun already," Susan answered.
“戏马上就要开演了，”我说。“说不定已经开演了呢”苏姗回答说。
知识点：比较学习：
must be (可能性大）：
He must be a teacher.
他很可能是一名教师。
may be (可能性稍小）：
He may be a teacher.
他也许是一名教师。
2."Can I return these two tickets?" he asked."Certainly,"the girl said.
我就立刻又回到售票处。
知识点1：go back = return 此句可改为:I returned to the ticket office at once.
知识点2：at once = immediately = as soon as = directly =instantly 立刻
