I've been working hard this week. I'm spent.
After all that exertion, we were completely spent.
exhausted 精疲力竭的
When the marathon ended, the young athlete was exhausted.
All three men were hot, dirty and exhausted.
She was exhausted by her long walk.
knackered：exhausted; very tired 精疲力竭的
Betty partied all night. In the morning, she was knackered.
I was absolutely knackered at the end of the match.
worn out： drained of energy or effectiveness,completely exhausted; worn or used beyond repair.精疲力尽;用坏了的，无法修复的。
I can't babysit any more. Children are a handful and I'm worn out!
Always replace worn out tyres with the same brand.
on my last legs：Near physical collapse or death 精疲力竭；奄奄一息，垂死
No more bargain hunting today. I'm on my last legs. Let's go home.
I knew I was on my last legs, so I was very relieved to see the marathon's finish line in the distance
Ed's on his last legs—you should probably try to visit him in the hospital today.
bargain hunting: the activity of looking for goods that are good value for money, usually because they are being sold at prices that are lower than usual.买便宜货，捡便宜
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