In other words

• I've never read such a good book.
• It's the best book I've ever read.

• Marcelo started studying German five years ago.
• Marcelo has been studying German for five years.

• When did Paul start work?
• How long is it since Paul started work?
• How long ago did Paul start work?

• Amanda moved to London six months ago.
• Amanda has been in London for six months.

• It's a long time since we went out.
• We haven't been out for a long time.

• She took 30 minutes to reach New York.
• It took her 30 minutes to to reach New York.