— Do you like bananas/ salad?

— Do you like bananas/ salad?
— Yes, I do. / No, I don't.
这里回答为什么用do而不用like啊?

看看这个你就明白的:
陈述句变一般疑问句
在句型转换中陈述句变一般疑问句是常见的题型之一,这一节我们一起来讨论如何将陈述句改为一般疑问句.在进入主话题之前请同学们回想一下我们学过了哪些时态?
Ss：一般现时,一般过去时,一般将来时,现在进行时,现在完成时……
T：对!这是我们必须掌握的五种时态,实际上,我们还学过过去进行时,过去将来时和过去完成时,只是这三种时态在初中阶段我们只须了解即可.我们今天要讨论的陈述句变一般疑问句主要围绕这些时态的句子进行.首先我们看一下一般现在时.谁来说一下该类句子谓语动词的特点?
S1：含be动词am ,is,are.
S2：含情态动词can,may,must,need等.
S3：含实义动词,如果句子主语是第三人称单数,谓语动词要像名词变复数一样在词尾加-s,-es.
T：Very good?那如果将含有这些动词的句子变为一般疑问句又该如何?
S1：将be动词提前.
S2：将情态动词提前.
T：那如果是实义动词呢?
S3：借助于助动词do或does,如果句子的主语是第三人称单数我们用does,此时原句里的第三人称单数的动词要还原.
T：对了,这一点是同学们最容易忽略的地方,下面两个句子请同学们在变化时留点神.
We usually do our homework after school．
Helen often does her housework after office．
S4：句中的do,does是实义动词而不是助动词,在变化后句中还得保留do.
T：Quite right?同学们掌握得相当不错,下面我们要谈论的基本上以此为基础,只是对不同的时态有一点点小的变化而已.
S5：将来时将will（would）或shall（should）直接提前.
S6：进行时更简单,be提前.
S7：完成时因have ／has或had是助动词,同样要把它前提.
T：一般过去时呢?
S8：借助于did呀,同样要注意将原句中的动词过去式还原.
T：看来同学们对陈述句变一般疑问句显得相当容易,这只是从方法形式上来讲,但在实际改写过程中大家往往因不注意一些小的问题而“痛失分数”.请大家在做此类转换时始终要把“改”字放心间.
Ss：
T：对了,改大小写,改标点符号,改……
Ss：改人称,改词语.
T：哪些词在变化中要改?
S9：改any.
S10：含some的合成词.
S11：already改为yet.
S12：老师,我们讨论了这么多,你能像以前一样给我们编个顺口溜吗?
T：好啊.请听好：
陈述变疑问,两种形式要分清.
Be、助、情,要提前,
行为实义三D帮,
一提二帮三改变,
变化多端好轻松.
练习：根据所给句子,填入所缺单词完成下列一般疑问句.
1．We had some work to do last Sunday．
_______ _______ _______ _______ work to do last Sunday?
2．I have already finished my homework．
_______ _______ finished _______ homework _______
3．Lily has some red and blue pencils．
_______ Lily _______ _______ red and blue pencils?
4．Jack often does some sports after class in the afternoon
_______ Jack often_______any sports after class in the afternoon?
5．We'll have to have an English test this morning．
_______ you______________ have an English test this morning?
6．Betty has her lunch at school every day．
_______ Betty_______ her lunch at school every day?
7．Jim always does his lessons in the evening．
_______ Jim always_______ his lessons in the evening?
8．The machine helps them to put rice in bags．
_______ the machine_______them to put rice in bags?
9．My father went to bed at eleven last night．
_______ your father_______ to bed at eleven last night?
10．He set the alarm clock for seven．
_______ he_______ the alarm clock for seven?
11．We are going to learn French next year．（2002,四川）
_______ you_______ to learn French next year?
12．Mr．Hu taught her maths last year．（2002,哈尔滨）
_______ Mr．Hu_______her maths last year?
13．Mike plays computer games every day．（南京）
_______Mike_______ computer games every day?
14．She has dinner with her grandparents once a week．（2002,深圳）
_______ she_______ dinner with her grandparents once a week?
Key:
1．Did you have any 2．Have you；your；yet 3．Does； have any 4．Does；do 5．Will；have to 6．Does；have 7．Does；do 8．Does；help 9．Did；go 10．Did；set（当主语是第三人称单数时,如果动词的过去式是其本身,要看句中的动词有无-s,-es来确定是一般现在时还是一般过去时,此句是一般过去时）11．Are；going 12．Did；teach 13．Does；play 14．Does；have