I have not seen him for weeks.

我已经有好几个星期没见他了。

youdao

I have not seen him for a long time.

我很长时间没看见他了。

youdao

My father works in other province and I have not seen him for half a year.

我爸爸在外省上班，我有半年没见过他了。

youdao

Whatever happens, as Ed has said, we have not seen the last of him.

BBC: The David Miliband Story

But county cricket may not have seen the last of him as he is contemplating the possibility of playing in next summer's Twenty20 Cup.

BBC: Curtain falls on Gough's career

Chavez has not been seen in public and officials have not released any photographs of him since he arrived in Havana for his fourth cancer operation in early December, fueling speculation that his health is worse than the government is letting on.

CNN: Chavez will not be sworn in on inauguration day