1. The last time my sister sang in choir was six years ago.
My sister last sang in choir six years ago
2. The last time she had a party was six months ago.
She last had a party six months ago.
3. He hasn't earned any money for three months.
The last time  he earned any money was three months ago.
4. I haven't fed the cat for six hours.
The last time  I fed the cat was six hours ago.
5. I haven't flown a plane for three years.
The last time I flew a plane was three years ago.