1.-May I go home now,Miss Yang?-No,you__________The key is "mustn't".I think "can't" is OK..Why not?Am I wrong?2.in a sweet voice Or with a sweet voice?3.SELL的被动,主动用法.4.One day in August,1862,Edison saw a little boy____ on the railway t

1.-May I go home now,Miss Yang?-No,you__________The key is "mustn't".I think "can't" is OK..Why not?Am I wrong?2.in a sweet voice Or with a sweet voice?3.SELL的被动,主动用法.4.One day in August,1862,Edison saw a little boy____ on the railway t
1.-May I go home now,Miss Yang?
-No,you__________
The key is "mustn't".I think "can't" is OK..Why not?Am I wrong?
2.in a sweet voice Or with a sweet voice?
3.SELL的被动,主动用法.
4.One day in August,1862,Edison saw a little boy____ on the railway tracks at a station.
The key is"playing",but "play",I think.
3.我记得老师说过..是不知什么时候东西卖的好什么的.或是..在出售或是...反正会用主动.,被动.什么的...
4.可是,,是ONE DAY..用ING太宽泛了吧

1.-May I go home now,Miss Yang?-No,you__________The key is "mustn't".I think "can't" is OK..Why not?Am I wrong?2.in a sweet voice Or with a sweet voice?3.SELL的被动,主动用法.4.One day in August,1862,Edison saw a little boy____ on the railway t
1:固定搭配
2:用...的语气:in a...voice.异口同声：with one voice
3:描述性质用主动如sth sells well.描述状态用被动如sth is sold out．不过也有特例：well-sold 这是副词＋过去分词组成形容词．类似有well-paid高中你会学的．
4：此处强调看到看到那一瞬时他正在playing.see sb do没有这含义．不过我个人认为在口语中无所谓．

.-May I go home now,Miss Yang?
-No,you__________
may的答句有许多种，都是根据语境来说"mustn't"比"can't"好点（我这题以前做的时候也错了）
2.in a sweet voice Or with a sweet voice
前面是用很甜美的声音说（应该把）
3.SELL的被动,主动用法. ...

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.-May I go home now,Miss Yang?
-No,you__________
may的答句有许多种，都是根据语境来说"mustn't"比"can't"好点（我这题以前做的时候也错了）
2.in a sweet voice Or with a sweet voice
前面是用很甜美的声音说（应该把）
3.SELL的被动,主动用法. 主动按时态被动把sell改sold严格参照have done
4.One day in August,1862,Edison saw a little boy____ on the railway tracks at a station.
用doing是指发生中，进行中
用do是指经常性，或看了全过程的

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1.用mustn't表示坚决不可以,语气强烈些
2.用in a sweet voice
3.被动be sold 主动就是sell吧
4.正在进行的动作要用ing的

1.musn't is stronger in tone.Maybe it is said by a teacher."You can't do it" is all right. Which one to choose really depends on the tone the speaker uses.
2.in a sweet voice is right.
3.Examp...

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1.musn't is stronger in tone.Maybe it is said by a teacher."You can't do it" is all right. Which one to choose really depends on the tone the speaker uses.
2.in a sweet voice is right.
3.Examples:
The shirts have been sold out.___passive
The shirts sell well.In only one week they have been sold out.
4.playing indicates that the action IS going on.

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1. can/can't means your ability, ok, as long as your legs are not disable, namly you can walk, so that you can go home.
mustn't means you'er not allowed, not your ability, leaving time does not...

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1. can/can't means your ability, ok, as long as your legs are not disable, namly you can walk, so that you can go home.
mustn't means you'er not allowed, not your ability, leaving time does not come, or your task remain unfinished, so that you mustn't go home.
2. in a sweet voice, while with one voice means everyone agrees with each other.
3. sell, sold, selling? what's up?
4. when play used, it means all the process are seen, while playing means just a sight at one moment of the whole process.

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Question 2: "In a sweet voice" is right!
Question 4: One day in August, 1862，暗示时间已经具体，所以用playing,表示Edison当时看到那个小男孩“正在”做什么。