零起点美语-I'm positive.

I'm positive.

我肯定。
A: Walter, did you email that document to Mr. Lin yesterday?
B: Yes, I did, Ms. Chen.
A: That's strange. I have Mr. Lin on the phone right now, and he says that he didn't receive any email from us yesterday. Are you sure you sent it?
B: I'm positive, Ms. Chen.
甲：华特，你昨天有没有将那份文件电传给林先生？
乙：有的，已传送出去了，陈小姐。
甲：那就怪了。我现在正与林先生通电话中，他说昨天并未收到我们传送的电子邮件。你确定寄出去了吗？
乙：我肯定，陈小姐。