1.work for 效勞；為…工作

Tom works for this firm
湯姆在這家公司工作。

The leaders of all nations should work for peace.
各國領導人都應該為和平做努力。

2.in return for 作為…的報答

I sent him a present in return for his help.
我送給他一份禮物以回報他的幫助。

In return for my wise counsel, he gave me the only fee I ever received for legal advice in the Elm Street Diner, a raffle ticket.
為了對我“精明的”建議表示回報，他給了我一張兌獎券，這是我在埃爾姆街餐館里得到的唯一一筆律師咨詢費。

3.belong to 屬于

They belong to the Knights of Columbus.
他們是哥倫布騎士會的成員。

He belongs to Chicago.
他是芝加哥的居民。

4.in exchange for 作為…的交換

You and the piece of grass are all they have given me in exchange for the whole world, which I enjoyed outside.
你和這小塊草皮是他們所給我的，用來交換我在外面享受著的整個世界的。

In exchange for your effort, you are rewarded with composting service, provided by reliable workers (the worms!).
以你的努力為交換，你將獲得由可靠的工人（蠕蟲）提供的堆制肥料服務。