“做某事有回报”，最常见的就是''be worth it''（which uses to say that ''you gain something from an action''）。
例：
（1）It was a lot of hard work, but it
was worth it.（虽然工作难度、工作量都很大，但是值得一做。）
（2）美剧《老友记》S02E06中对话：
Chandler和Joey两个大男人带了一个小baby、提着大包小包去逛街，Chandler怨声载道，Joey打的小算盘是baby可以吸引年轻女性的注意，原来他想借baby泡妞，难怪他说：（拿再多东西）也是值得的！
CHANDLER: You know, I don't think we
brought enough stuff. Did you forget to pack the baby's anvil?
JOEY: I'm telling you, it's gonna be
worth it. It's a known fact that women love babies, all right? Women love
guys who love babies. It's the whole sensitive thing.
与“be worth
it”相反，就是“be
not worth it”（which uses
to say that ''you do not gain anything from an action''），不值得去做。
例：
I thought about trying to talk to him about
it, but decided it wasn't worth it.（我本想试着跟他谈谈这事儿，但又想，谈了也没用。）
第二种说法就是''pay
off ''（if a plan or
attempt or your hard work pays off, it brings you success after a long time）。
例：
（1）My persistence finally paid off
when they called me in for an interview/when I was offered the job of manager.（他们给了我面试的机会/我被任命为经理，我的付出终于有回报了。）
（2）《老友记》S02E05中对话：
这是一部90年代的剧集，那时候即使在美国，电话也不是人人都有的。Chandler家有电话，有位女士打错了电话，把Chandler当成她曾经约会过的一个男生，要约他见面。Chandler得意地说：装电话终于值了（因为靠它骗到MM了）！
CHANDLER: Okay. Having a phone has finally
paid off.
第三种说法就是''it
pays to do something''（if a particular action pays, it brings a good result or advantage
for you）。
例：
（1）Crime doesn't pay.（犯罪没好结果。）
（2）In my experience, it doesn't pay to argue with her.（据我以往的经验，跟她吵架没用。）
（3）It might pay to get your roof fixed before winter comes.（在冬天到来之前把屋顶修好，可能有利于过冬。）
（4）Taking care of your customers pays big dividends in
the long run.（把顾客伺候好，长远来看，会带来巨大利润。）
dividends原意是“红利”，pay/bring dividends引申为''to be very useful and bring a
lot of advantages, especially later in the future''，长远角度来说能够取得回报。
如：
Good eating habits will pay dividends
later on in life.（好的饮食习惯会使今后生活受益匪浅。）
（5）《老友记》S01E22中对话：
Chandler介绍朋友Phoebe去他的公司上班，下班后，朋友们问她第一天上班怎么样。Phoebe说很不错，大家都对她很好。Chandler以为是自己的功劳，说：认识我还是有好处的。（而且他不直接说“认识我”，还拐着弯说“认识穿我鞋子的那个人”——言外之意就是“我”了。）
Chandler: See, it pays to know the man who
wears my shoes.
(Joey and Ross wonder what he means)
Chandler: —Me!
虽然“做某事有回报”有以上几种说法，但用法各不相同，从例子中大家可以体会、区分一下。