A: Is this your briefcase, Dr. Jansen?
B: No, it isn’t. Maybe it’s Dr. Baker’s. A: Dr. Baker is in the hospital. He’s not very well. B: Was he in the hospital last week, too? A: No. He was very well last week. B: You were in Washington, D.C. for several days, weren’t you? A: Yes, I was. I was in Washington in December. B: Where were you in November? A: I was here in November. That was two months ago. B: Wasn’t your friend Harry here last week? A: Yes. He was here for three days last week. A：詹森博士，今天是星期几？ B：今天星期一。现在是1 月。 A：詹森博士，这是你的公文包吗？ B：不，不是。这可能是贝克博士的。 A：贝克博士住院了。他现在不是很好。 B：他上周是不是也在医院？ A：不是。上周他还好好的呢。 B：你在华盛顿住了几天是吗？ A：是的。12 月我在华盛顿。 B：那11 月你在哪儿？ A：11 月，我在这儿。那都是两个月前的事了。 B：你的朋友哈里上周不在这儿吗？ A：是的。他上周在这儿待了3 天。