一、直接问句及间接问句
(1) 直接问句(WH问句) => 疑问词(为首) + (beV + S / aux + S +VR)?
例：Who is that tall girl? (那个高个子女孩是谁？)
(2) 间接问句 => 主要子句 + 疑问词 + S + (beV ~ / V~ / aux + VR~)
例：I have no idea who that tall girl is. (我不知道那个高个子女孩是谁)
注意：间接问句句尾的标点符号以主要子句为准
二、间接问句的形成
(1) be动词 => 疑问词(句中) + S + beV~
例：1. What is this? (这是什么?)
=> I don't know what this is. (我不知道这是什么)
2. Who is the girl standing at the door? (站在门口的女孩是谁)
=> Do you know who the girl standing at the door is? (你知道站在门口的女孩是谁吗?)
3. Where are you going with your mom? (你要和你妈妈去哪里？)
=> Tell me where you are going with your mom. (告诉我你要和你妈妈去哪里)
(2) 一般动词 => 疑问词(句中) + S + V(注意时态表现)
例：1. Where does she live? (她住在哪里?)
=> Let me know Where she lives. (让我知道她住在哪里) (助动词does在肯定句中没有意思，所以去掉，没有助动词后，一般动词需要表现出时态，此处为现在式，第三人称单数+S)
2. When did they leave for Australia? (他们什么时候去的澳大利亚) (leave for + 地点 表示去某个地方，leave + 地点 表示离开某个地方)
=> We'd like to know when they left for Australia. (我们想知道他们是什么时候去澳大利亚的) (助动词did在肯定句中没有意思，所以去掉，没有助动词后，一般动词需要表现出时态，此处为过去式，leave改为left)
3. Why didn't you go to the office by bus? (你为什么不坐公共汽车去办公室？)
=> Please tell me why you didn't go to the office by bus. (请告诉我你为什么不坐公共汽车去办公室) (助动词didn't在此处表示 不 的意思，不能去掉)
(3) 助动词 => 疑问词(句中) + S + aux(can. will等) + VR
例：1. How can the little boy move the large box? (小男孩怎样才能搬动这个大箱子)
=> I wonder how the little boy can move the large box. (我想知道小男孩是怎么搬动这个大箱子的)
2. Please tell me why I must take care of the little girl. (请告诉我为什么我必须照顾这位小女孩)
(4) 疑问词(即为主词) => 疑问词(句中) + beV / V / aux
例：1. Will you let me know what happened to you? (你能告诉我你发生了什么事吗？)
2. Do you know who broke the antique vase? (你知道是谁打碎了古董花瓶吗？)
3. Nobody know who cheated on the exam. (没人知道谁在考试时作弊)
三、特别注意的间接问句
(1) 含 do you (think / guess / say等)的间接问句
例：1. Who will be sent to the United States? (谁将被派往美国?) Do you think
=> Do you think who will be sent to the United States? (X) (用助动词Do开头的问句，需要用yes回答，这句问：你认为谁会被派去美国，回答：是啊，我认为。答非所问，语句错误)
=> Who do you think will be sent to the United States? (你认为谁会被派往美国？) I think it will be Tom. (我认为是汤姆)
2. What time will the class begin? (什么时间开始上课?) Do you say?
=> Do you say what time the class will begin? (X)
=> What time do you say the class will begin? (你说什么时候开始上课?)
(2) 名词片语 => 疑问词 + to V (当主词，受词，补语)
例：1. The poor girl doesn't know what she has to do. (这可怜的女孩不知道自己该做什么)
what she has to do为名词子句，因为The poor girl等于she，主词一样。所以she省略，因为动词是看主词的脸色，主词省略，所以动词has也省略。变成名词片语 what to do。
=> The poor girl doesn't know what to do.
2. Do you know where to go? (你知道该去哪里吗?)
Do you know who to ask? (你知道该问谁吗?)
Do you know how to do it? (你知道该怎么做吗?)
Do you know what to do? (你知道该怎么办吗?)
bell the cat(担当危险任务)
3. 当主语：Who to bell the cat is a big problem. (谁来担当这个危险的任务是个问题)
当补语：The problem is who to bell the cat. (问题是谁来担当这个危险的任务)
当受词：We don't know who to bell the cat. (我们不知道谁来担当这个危险的任务)
(3) 不含疑问词的问句(即yes/no问句)的间接问句需用 if / whether (是否) + S + V 引导
例：1. Will he buy the convertible? (他会买敞篷车吗？)
=> I don't know (if / whether) he will buy the convertible. (我不知道他是否会购买敞篷车)
2. Is it convenient for you to drive me home? (你开车送我回家方便吗？)
=> I'd like to know (if / whether) it is convenient for you to drive me home. (我想知道你是否方便开车送我回家)
