前一周接待来自国内的一批顶级学者，长江学者、中南海学者、知名学者等等，一番忙碌。一次陪一位专家到本地西餐厅吃饭，专家点的饭食上来后，服务员说了一句Enjoy! 专家事后问我，不说总是说Enjoy yourself! Enjoy it!吗？后面这个不要了？

我明白，专家的意思是enjoy应该是及物动词，后面必须跟宾语，而不能用作不及物动词。

这的确是老师很多时候告诉中国学生的一个常用词的常用错误问题，因为汉语中此情此景我们通常会说“请用”“慢慢享用吧”“好好享受吧”等等，但我们也会说“请用餐”“慢慢享受咖啡吧”“享受一下这里的清新空气”等等。

所以老师总会提醒学生，enjoy, like这样的词必须跟宾语，尤其是it。

不过，尽管enjoy yourself中的yourself是代词，理论上是宾语，但其语义内涵上，enjoy yourself也可以理解为enjoy it by yourself，这就不再是宾语了，而是状语了。

由此，在餐厅服务等情境，有些服务员更愿意使用 Enjoy! 而不说更为正式的 Enjoy your meal! Enjoy yourself! 也就是说，这里的 Enjoy! 其内涵就是 Enjoy your meal by yourself!

为说明我的解释，我随后专门做了一点功课，向专家说明。特分享。

Enjoy的这种用法在一些词典中也有较为明确的说明。

Enjoy! = Enjoy yourself!这一用法在美国的兰登的一部词典Random House Kernerman Webster's College Dictionary有较为明确的说明，并明确注明这是非正式用法。

Enjoy

v.t. 
 1.  to take pleasure in; experience with joy.

 2.  to have the benefit of; have and use with satisfaction:  to enjoy a six-percent rise in sales.
v.i. 
 3.  Informal. to enjoy oneself.

另一部著名的美国词典The American Heritage® Dictionary of the English Language也说明了enjoy可以不及物，不过没有具体说明是否指的是enjoy yourself这样的用法。

enjoy

v.tr.
1.  To receive pleasure or satisfaction from.

2.  To have the use or benefit of: enjoys good health.

v.intr.
To have a pleasurable or satisfactory time.

英国的剑桥词典把enjoy列为及物动词，把enjoy yourself单列为词条，把enjoy的非正式用法也单列：

enjoy verb [T]  

A1 to get pleasure from something:

   I really enjoyed that film/ book/ concert/ party/ meal.

   [ -ing verb] I want to travel because I enjoy meeting people and see ing new places.

enjoy yourself

A2 to get pleasure from the situation that you are in:

    I don't think Marie is enjoying herself very much at school.

    Come on, why aren't you dancing?

    Enjoy yourselves!

enjoy! informal ›

    something you say to someone when you have given them something and you want them to enjoy it:

   Here are your drinks. Enjoy!

英国的牛津词典明确说明enjoy必须跟宾语，不过也说在祈使句中，主要在北美地区，非正式用法也单独使用。

enjoy verb [with object]

1  take delight or pleasure in (an activity or occasion):

    I enjoy watching good films
    (enjoy oneself) have a pleasant time:I could never enjoy myself, knowing you were in your room alone
    [no object, in imperative] informal, chiefly North American used to urge someone to take pleasure in what is being offered or is about to happen:

    Bake until the filling starts to bubble and the crust turns golden brown. Enjoy!
2  possess and benefit from:

    the security forces enjoy legal immunity from prosecution

英国的Collins词典坚持注明其只能是及物:

  1  VERB  V n/-ing

If you enjoy something, you find pleasure and satisfaction in doing it or experiencing it.
           Ross had always enjoyed the company of women...
           I enjoyed playing cricket.

   2  VERB  V pron-refl

      If you enjoy yourself, you do something that you like doing or you take pleasure in the situation that you are in.
           I must say I am really enjoying myself at the moment.

   3  VERB  V n

      If you enjoy something such as a right, benefit, or privilege, you have it. (FORMAL)
           The average German will enjoy 40 days' paid holiday this year... 

结论与建议：

       1、渥太华餐厅服务员在非正式场合说 Enjoy! 代替 Enjoy your meal! Enjoy yourself! 是北美地区非正式英语的用法，并非语误。

      2、Enjoy 在书面表达、正式交谈中必须跟宾语。

      3、在北美地区，或者与北美人士交谈，或想突出自己英语的北美特征以及混合特征时，可以在非正式场合，如吃饭、喝茶等之时，可以使用 Enjoy! 代替Enjoy your meal. Enjoy some tea. 等。否则，不建议如此使用。