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问题 afternoon可以直接连用不定冠词吗

I can do all this work in an afternoon.这个句子中的 in an afternoon 用得对吗？

问题 英语长句语病修改

During their university life, it is useful for them to join in colorful activities and develop their characters and abilities, such as do a part time job, to be a volunteer or a trainee and so on.这句话有哪些语法错误？

问题 一个奇怪句子的成分分析

The types of molecules that can do this are themselves substantially hydrophobic in nature such as carbon dioxide, oxygen or ethanol.疑问：这句话中 themselves 是做表语么？那么 substantially hydrophobic 又是什么成分？

问题 条件状语从句从句时态问题

supposing he won't pass the exam,what should he do？    为什么supposing 引导的条件状语从句不用一般现在时代替一般将来时，而用将来时won't     

问题 to很奇怪，是印刷错误吗？

he might say something without meaning to, which would do me great harm.老师，to这里是作副词的，什么意思了，难道印刷错误？

问题 句子成分分析

1. I want Tom to read a book to do是否做宾补？即，Tom is to read a book是成立的？ 2. Fern was upstairs changing her sneakers. changing xxx是否是做主语补语？即，She is changing xxx成立？ 或者，上述理解是错的，有其他理解。

问题 关于propose的用法

网上看视频看见一个老师举了个例子authorities should be proposed to adopt actions.这句话变成主动不就是people propose authorities to adopt actions吗。但是我没看见字典有propose sb to do sth 的用法啊。请老师回答下，非常感谢

问题 street children是什么意思

street children是什么意思Do street children go to school, and if not, why not? 请问句句的street children是什么意思？是“小混混”的意思吗？全句如何翻译比较好？

问题 it 的指代疑问

If you smell or hear a gas，get everyone outside and open the windows and doors. If you can do it safely，turn off the gas. Report it to the gas company.两个it分别指什么呢？

问题 positive clause 是什么意思

Like positive clauses, however, they may be followed by positive tag clauses that do not have subject-operator inversion.请问句中的 positive clause 是什么意思？

问题 let用法的若干疑难问题

1. let 后面可以加 it 加情态动词（例如can）吗？怎么没见过这种用法？2. let不是 sb do sth 吗？为什么会有 let it go? 这里的的 it 是什么意思？

问题 what time作什么成分

What time do you get home?---At 6:00 p.m.老师，为什么用what time ;at what time=when.what是限定词，time是名词；what time作什么成分？

问题 being racist…成分的分析

The group has also weathered accusations that it reinforces self-hating stereotypes or being racist toward white people. 这里的being是和reinforce连起来看吗，reinforce doing?

问题 ever用法

I looked into the boy's serious but eager face and asked him," Do you want any more books?" "Yes, more than I can ever get," he replied.麻烦问一下老师 I can ever get中的ever如何理解？ 老师能否归纳一下ever的用法呢？谢谢！

问题 should have done表推测

Sonia should have been home by now. Do you think she’s OK?这个 should是表示推测， have been ... 又是表示现在完成时吗？