do you have lunch? did you have lunch? have you had lunch? do the three sentences have the same meaning? 你刚刚吃过了吗？你已经吃过了吗？这两句有什么区别？ 如果要问别人吃过饭没，应该用哪个句型？ 回复：浪子 我对您的过去时态的说明不是很理解。既然可以说I had lunch yesterday，为什么不能说did you have lunch（你吃过饭了吗） 呢？
英语中根据时间和形式一共有16种时态: 1. 一般现在时:结构:由动词表示;但是，如果主语是第三人称单数，将谓语动词改为第三人称单数形式. 2. 一般过去时:结构:由动词的过去式表示，动词的过去式有规则变法和不规则变法两种(规则变法就是在动词后面加ed的那种;不规则变法，在教科书单词的后面有一页是表示动词不规则变法的). 3. 现在进行时:结构:由助动词(am/ is/ are)+动词的现在分词表示.动词的现在分词，就是在动词后面按要求+ing. 4. 现在完成时:结构:有助动词(have/has)+动词的过去分词.动词的过去分词的变法跟动词过去式的变法相同. 5. 现在完成进行时:结构:有助动词(have/has)+助动词been+动词的现在分词表示. 1.一般现在时: eg. He goes to school by bike every day. 否定句:He doesn't go to school by bike every day. 一般疑问句:Does he go to school by bike every day? 特殊疑问句: (He):Who goes to school by bike every day? (goes to school):What does he do by bike every day? (by bike):How does he go to school every day? (every day):When does he go to school by bike? 2. 一般过去时: eg. He wrote a letter last night. He didn't write a ltter last night. Did he write a ltter last night? (He):Who wrote a ltter last night? (wrote a letter): What did he do last night? (last night): When did he write a letter? 3. 现在进行时: eg. They are playing football there. They aren't playing football there. Are they playing football there? (They): Who is playing football there? (playing football): What are they doing there? (there):Where are they playing football? 4. 现在完成时: eg. Tom has worked in that company for 5 years(=since 5 years ago). Tom hasn't worked in that company for 5 years. Has Tom worked in that company for 5 years? (Tom):Who has worked in that company for 5 year? (in that company):Where has Tom worked for 5 years? (for 5 years):How long has Tom worked in that company? 5. 现在完成进行时: eg. He has been reading in his room the whole day. He hasn't been reading in his room the whole day. Has he been reading in his room the whole day? (He):Who has been reading in the room the whole day? (reading):What has he been doing in his room the whole day? (in his room):Where has he been reading the whole day? (the whole day):How long has he been reading in his room? 不知道是否帮到你.