讓我們先來看看adequate, sufficient, enough這三個詞的英漢雙解釋義和例句，然後再進行區分。

adequate (to/for something): satisfactory in quantity or quality; sufficient （數量或質量）令人滿意的; 足夠的; 充分的; 適當的

take adequate precautions 採取適當的預防措施

Our accommodation is barely adequate. 我們的住房不太夠用。

Their earnings are adequate (to their needs). 他們掙的錢足夠（需要）。

Your work is adequate but I"m sure you could do better. 你的工作做得不錯, 但是我肯定你還能做得更好。

She has adequate grounds for a divorce. 她離婚有充分的理由。

sufficient (for something / somebody) enough 足夠的; 充足的

sufficient money, time, fuel 足夠的錢﹑ 時間﹑ 燃料

Is 10 sufficient for your expenses? 10英鎊夠你用的嗎?

Do we have sufficient (food) for ten people? 我們有夠十個人吃的（食物）嗎?

(a) (used in front of a plural n. or a [U] n. 用於複數名詞或不可數名詞前) enough something (for somebody / something); enough something (for somebody) to do something: as many or as much of something as necessary; sufficient 足夠的; 充足的

Have you made enough copies? 你複製的份數夠嗎?

Have we got enough sandwiches for lunch? 我們午飯的三明治夠吃嗎?

Surely 15 minutes is enough time for you to have a coffee. 你喝杯咖啡15分鐘當然足夠了。

I"ve got enough money to pay for a taxi. 我的錢夠付計程車費的。

There isn"t enough space for my address. 我寫地址的地方不夠。

(dated 舊) There"s food enough on the table. 桌上的食物足夠吃。

We have time enough to get to the airport. 我們來得及趕到機場。

(b) as many or as much as necessary 充分; 足夠

Six bottles of wine will be enough. 六瓶葡萄酒就夠了。

Is 100 enough for all your expenses? 100英鎊夠你的全部開銷嗎?

I hope enough of you are prepared to help with the show. 我希望你們中能有足夠的人手準備協助這場演出。

They were able to save enough of their furniture to fill a room. 他們能省出的傢俱足夠裝滿一間屋子。

（1）adequate修飾不可數名詞，也指質量上很好。

The supply is not adequate to the demand. 供不應求。

（2）sufficient客觀需要上的充足，強調數量。

Sufficient data have been collected for the building project. 為這項建築工程已經收集了充分的資料。

（3）enough一般用詞，表示主觀需要的充足。

She sang well enough, but the show was a failure. 她演唱得算好了，但演出確實個失敗。