They have been doing their homework能改成：he has been doing their homework 吗?have改成了has

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• 改反义疑问句17.You think he is a good flight attendant,_______________ 18.Nobody knows where she lives,_______________ 29.They have been there twice,_______________ 37.He has studied here for about four years,_______________ 39.Few of them hurt themselves in the accident last night,_______________ 40.Peter could hardly see the words on the blackboard,_______________ 45.You must do your homework by yourself,_______________ 46.You mustn’t touch the machine,__
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• They can’t have been doing their homework,能不能改成下面句子They isn't doing their homework----------------改前和改后的句子除了语气不一样外,还有别的不一样吗?
• 根据首写字母及句意补全单词.China is a country with a l___ population.Everyone should care for wild a____ and piant more trees.He has been dead s___ 10 years ago.--Why didn't you tell her about that?--I couldn't ring her beacuse I hadn't got her n___.China has developed r___ in recent years.Have you s___ tow hours doing your homework?Everyone should c___ for wild animals.They keep their children from w____ TV on weekdays.--Do you like milk or coffee?--I p___ milk t
• 将下列句子改成疑问句和否定句 He has done his homework.Their teacher has been to beijing.还有：They have just finished the work.You have already seen the film.Mr.li has been here for two weeks.Xiao li and xiao wang have had lunch.
• Jim has been over his homework and he is free now这句可以等于下面那句吗?帮我挑挑刺,Jim has finished doing his homework already.He is free now
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• They have been doing their homework能改成：he has been doing their homework 吗?have改成了has
• They can’t have been doing their homework--句中“can't"是不是可以直接去掉,从语法上来讲没有错啊?还有They can’t have been doing their homework能改成：They haven't been doing their homework
• 4.5g水与_g硫酸所含的分子数相等，它们所含氧原子数之比是_．
• 4.5g水与_g硫酸所含的分子数相等，它们所含氧原子数之比是_．