Ben is a foreign teacher. So far, he        in Zhengzhou for five years.

—Why don’t you go to the movie with me, Betty?
—Because I       it before.

—Lily, why are you still here? School is over for half an hour.
—Because I       my task yet. I still need one more hour.

—I’d like to introduce my best friend to you, Peter.
—Thank you, Lucy. But we        already.

She         the book         two days ago.

—How long have you         the bike?
—For about two weeks.

—How well do you know the Sydney Opera House?
—I know the place very well. I        Sydney many times.

—Hello! Is that Mr. Jiang?
—No, he       Guiyang. He will be back in two weeks.

My father has        come here, but my mother hasn’t come here      .

—        you ever         the new museum?
—No, I haven’t.