I have never seen a dirtier-looking dog.
=>This is the first time I have seen a dirtier-looking dog.
1. He hasn't laughed so much for ages.
-> It's ages since he last laughed.
2. I haven't enjoined myself so much for ages.
-> It's years since I enjoyed myself so much.
3. The telephone rang for hours.
-> It's hours since the telephone rang.
4. I haven't seen him for ages.
-> It's ages since I last saw him.
5. Ly's father started to stop smoking last year.
-> Ly's father has stopped smoking since last year.
6. The editor hasn't written to Mai for a month.
-> The editor last wrote to Mai a month ago.
7. How long have you learned Spanish?
-> How long ago did you start to learn Spanish?

Thanks

I have never seen a dirtier-looking dog.
=>This is…the first time I have seen a dirtier-looking dog.……

Thank you