We have studied math for three years.
Ken has wanted a new racket since last month.
Andy has been sick since yesterday.
I have been in the library for three hours.
Have you played soccer for three years? Yes, I have.
Has Takeshi been busy since last week? No,he hasn’t
I haven’t practiced soccer for three years.
My sister hasn’t been in Australia since last week.
I have seen him.
My sister has made curry.
Have you ever been to China?
Has Ken ever seen this movie?
I have never visited Canada.
Yuki has never written a letter in English

だと思います！