下面的句子出自徐广联主编《当代高级英语语法》(精装版)：The city is much different from what it was twenty years ago. 这座城市和20 年前大不一样了。但我们的老师说，You are much different from your brother 是错的，上面这两个句子有区别吗？
句子：It was unclear whether the forest had been cleared by farmers to plant fields, or by hunter-gatherers, so they could hunt more easily.问：请问老师，by farmers to plant fields中to plant fields是farmers的定语，还是目的状语，然后逻辑主语由by引导。除了for还有...
...d shrink the earth's population to a village of precisely 100 people, with all the exsting human ratios remaining the same, it would look something like the following......1) precisely 副词是句子副词，即修饰整个if从句的吗？不然precisely副词应该如何分析呢？2）虚拟...
...g people
who have dropped out of the labor market, having lost all hope of being able to
work for a decent living我在想是不是having...living是young people的非限制定语从句，或者说是从句中的伴随状语呢？having没有自带逻辑主语，那它的逻辑主语应该是前一...
...？属于什么用法？比如：If you ever visit London, you must come and stay with us. 你要是到伦敦来，一定要到我们这里住住。If you ever need anything, please don’t hesitate to contact me. 你若需要什么东西，请直接与我联系。请老师帮我分析一下，谢...
...ng is “native”, meaning indistinguishable from other types of content, and sometimes even encrypted. That makes network-based blocking hard, if not impossible.请问：(1) 第一段话的主、系、表分别是 the fastest-growing sort of mobile advertising、is、native，那后面的两个句...
And look how many strangers there are here today……请问how many后面不是跟疑问句式吗？所以不是are there，但是这里用了there are，是因为整个句子是陈述语序，所以how many后面也跟的陈述语序吗？那是不是大多数疑问词也是这种用法呢？
...ory of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States（当今大不列颠国王的历史，是接连不断的伤天害理和强取豪夺的历史，这些暴行的唯一目...
The list included most of the things Hugh loves: butter, potatoes, rice, beer, milk, chocolate，and sweets. 如果主句是一般过去时态，从句常用过去的某种时态；这里时态为什么不一致？为什么用loves而不是用过去时？
...先于谓语动作。
然而，像这样的句子，Do you remember John and his father coming to see us last Christmas？这里的coming to...肯定是发生在remember之前了，而且还应该是间隔着不短的时间，可却没有用having come 来表示，我觉得很奇怪。