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He didn't know _____ when his mother wasn't at home.
A.how should he do
B.what should he do
C.what to do
A.how是肯定不对的.分析语句看是to do "what"还是"how".句意是表达这人的无所事事而不是具体到某件事情怎么做，所以是What。
B.那么这个选项是What了，选么？不选。因为如楼上的楼上所说，应该是He didn't know what he should do...才对。What should he do?已经是一个问句了，在从句中要注意倒装。
C。对的。what to do 就表示了一个将来的时态。to do what 的倒装。
做这种题懂语法当然可以做出来，不懂得话就像现在教育提倡的语感来做也可以的。
(一) 正误辨析
1、［误］ We got to the top of the mountain in daybreak.
［正］ We got to the top of the mountain at day break.
［析］ at用于具体时刻之前，如：sunrise, midday, noon, sunset, midnight, night。 2、 ［误］ Don't sleep at daytime
［正］ Don't sleep in daytime.
［析］ in 要用于较长的一段时间之内，如：in the morning / afternoon, 或 in the week / month / year. 或 in spring / supper /autumn / winter等等。
3、 ［误］ We visited the old man in Sunday afternoon.
［正］ We visited the old man on Sunday afternoon.
［析］ in the morning, in the afternoon 如果在这两个短语中加入任何修饰词其前面的介词都要改为on, 如：on a cold morning, on the morning of July 14th
4、 ［误］ He became a writter at his twenties
［正］ He became a writter in his twenties
［析］ 这句话应译为：他在20多岁时就成了作家。在某人的一段生活时间段中要用介词in来表示，而在具体岁数时用at来表示。
5、 ［误］ He went to New York to find a job in sixteen years old.
［正］ He went to New York to find a job at sixteen.
［析］ 在具体年岁前用at, 如：at the age of 12， at your age， 等等。
6、 ［误］ We went to swim in the river in a very hot day.
［正］ We went to swim in the river on a very hot day.
［析］ 具体某一天要用介词on, 又如：on New Year's Day
7、 ［误］ I'm looking forward to seeing you on Christmas.
［正］ I'm looking for ward to seeing you at Christmas.
［析］ 在节日的当天用on，而全部节日期间用at,Christmas是圣诞节期间，一般要有两周或更长的时间。
8、 ［误］ I haven't see you during the summer holidays.
［正］ I haven't seen you since the beginning of the summer holidays.
［析］ during表示在某一段时间之内，所以一般不与完成时搭配，如：I visited a lot of museums during the holiday. 而for表示一段时间，可以用于完成时，如：I haven't see you for a long time. 而through 用来表示时间时则为"整整，全部的时间"。如：It rained through the night.而since则是表达主句动作的起始时间，一般要与完成时连用
9、 ［误］ At entering the classroom, I heard the good news.
［正］ On entering the classroom, I heard the good news.
［析］ On 加动名词表示"一……就"。本句的译文应是：我一进入教室就听见这个好消息了。又如：on hearing… 一听见， on arrival 一到达就……(on表示动作的名词)
10、 ［误］ In the beginning of the book, there are some interesting stories.
［正］ At the beginning of the book, there are some interesting stories.
［析］ at the begining与at the end都是指某事物的开始与结束部分，均不指时间范围，而in the beginning 则是指开始一段时间。in the end＝at last是指"最终，终于"之意。
11、［误］ Till the end of next week. I will have finished this work.
［正］ By the end of next week. I will have finished this work.
［析］ by 引起的时间状语表示了动作的截止点，其意思为"不迟于某一时刻将工作做完"，
大概出一点 希望对你有帮助
A.how should he do
B.what should he do
C.what to do
A.how是肯定不对的.分析语句看是to do "what"还是"how".句意是表达这人的无所事事而不是具体到某件事情怎么做，所以是What。
B.那么这个选项是What了，选么？不选。因为如楼上的楼上所说，应该是He didn't know what he should do...才对。What should he do?已经是一个问句了，在从句中要注意倒装。
C。对的。what to do 就表示了一个将来的时态。to do what 的倒装。
做这种题懂语法当然可以做出来，不懂得话就像现在教育提倡的语感来做也可以的。
(一) 正误辨析
1、［误］ We got to the top of the mountain in daybreak.
［正］ We got to the top of the mountain at day break.
［析］ at用于具体时刻之前，如：sunrise, midday, noon, sunset, midnight, night。 2、 ［误］ Don't sleep at daytime
［正］ Don't sleep in daytime.
［析］ in 要用于较长的一段时间之内，如：in the morning / afternoon, 或 in the week / month / year. 或 in spring / supper /autumn / winter等等。
3、 ［误］ We visited the old man in Sunday afternoon.
［正］ We visited the old man on Sunday afternoon.
［析］ in the morning, in the afternoon 如果在这两个短语中加入任何修饰词其前面的介词都要改为on, 如：on a cold morning, on the morning of July 14th
4、 ［误］ He became a writter at his twenties
［正］ He became a writter in his twenties
［析］ 这句话应译为：他在20多岁时就成了作家。在某人的一段生活时间段中要用介词in来表示，而在具体岁数时用at来表示。
5、 ［误］ He went to New York to find a job in sixteen years old.
［正］ He went to New York to find a job at sixteen.
［析］ 在具体年岁前用at, 如：at the age of 12， at your age， 等等。
6、 ［误］ We went to swim in the river in a very hot day.
［正］ We went to swim in the river on a very hot day.
［析］ 具体某一天要用介词on, 又如：on New Year's Day
7、 ［误］ I'm looking forward to seeing you on Christmas.
［正］ I'm looking for ward to seeing you at Christmas.
［析］ 在节日的当天用on，而全部节日期间用at,Christmas是圣诞节期间，一般要有两周或更长的时间。
8、 ［误］ I haven't see you during the summer holidays.
［正］ I haven't seen you since the beginning of the summer holidays.
［析］ during表示在某一段时间之内，所以一般不与完成时搭配，如：I visited a lot of museums during the holiday. 而for表示一段时间，可以用于完成时，如：I haven't see you for a long time. 而through 用来表示时间时则为"整整，全部的时间"。如：It rained through the night.而since则是表达主句动作的起始时间，一般要与完成时连用
9、 ［误］ At entering the classroom, I heard the good news.
［正］ On entering the classroom, I heard the good news.
［析］ On 加动名词表示"一……就"。本句的译文应是：我一进入教室就听见这个好消息了。又如：on hearing… 一听见， on arrival 一到达就……(on表示动作的名词)
10、 ［误］ In the beginning of the book, there are some interesting stories.
［正］ At the beginning of the book, there are some interesting stories.
［析］ at the begining与at the end都是指某事物的开始与结束部分，均不指时间范围，而in the beginning 则是指开始一段时间。in the end＝at last是指"最终，终于"之意。
11、［误］ Till the end of next week. I will have finished this work.
［正］ By the end of next week. I will have finished this work.
［析］ by 引起的时间状语表示了动作的截止点，其意思为"不迟于某一时刻将工作做完"，
大概出一点 希望对你有帮助
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