he must be in the office.be换成is 可以么

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• he is sitting beside his mother 后面那个his 要换成him么
• A:Is he sitting on a football?B:No,he's not.He's sitting on a basketball.可以换成No,he isn't .
• That is to say,the context of each word is collected,along with the word itself.翻译成：也就是说,上下文中的每一个词都考虑（收集）在内,也包括那个单词本身；①可以这样把That is to say后面的逗号换成that么?②along with the word itself作伴随状语,伴随状语是谓语的伴随状语么?③怎么理解“也包括那个单词本身”?
• i saw him watching the football match.和i saw he was watching the football match.都对么我就是不太清楚see后可以加从句么？
• He is working hard是不是一个完整的句子,有人说没有谓语.is working hard不是系表结构么,可以做谓语
• He is at desk .与The family are at table.这2句有语病么.动词后可以直接加介词?
• so he must stay in bed for a week因此他必须卧床一周 这句话he是第三人称为什么动词stay没有换成stays,还有就是解释一下for在这句中的用法
• He has made much progress in his field in the past twenty years.能换成since the past 20 years么
• He works much harder than i do,这里的much修饰harder,如果把much换成more可以吗?
• "it is not until 10o'clock that he went to bed" 可改为“it is until 10o'clock that he wasn't go to bed”么?就等于把否定后置,可以么?
• We are so bored,and we ____(fall)asleep用所给动词的正确形式填空
• heard from ,heard of的区别长时间不看,忘了