我找到两种说法，一是时态不变,例句：Scientists discovered that DNA holds the code for life.一是时态可变可不变，例句Copernicus proved that the earth goes/went round the sun.请问如何理解这两个句子？
...her descendants.老师请问这个句子中remain是a grand mother of mine 的谓语吗?还有to her last day是不是状语?但是有to her last day这种用法吗为什么不是till呢新东方语法网站上写的是to后接时间时如果没有from用till／until
Longfield Park has a programme of activities throughout the year，and to give you a sample ，this is what's happening in the next few days.请问这里为什么是“to” give you a sample？直接用give不可以吗？
That China and Thailand shall cooperate in the field of railway is in line with the respective development need of both countries, and would be truly of mutual benefits and win-win should such cooperation be successful.问：上句中不用 that完全不影响表达，这句中为什么要开头用...
There was a bit of me that
didn’t want to love this when everyone else on the planet did, but the horror
story is brilliant. There’s tension and anxiety from the beginning as Nick and
Amy battle for your trust. It’s a real whodunit and the frustration when you
realise what’s going on is horr...
...否该用被动语态？他独自一人完成了这项被认为是不可能的任务。He finished the task which was thought to be impossible to finish on his own.是否应改为：He finished the task which was thought to be impossible to be finished on his own.
...元领域。这里的as··as是比较状从么？as2后面不是应该接从句嘛？为什么能够接例子？划线句能否改成：, in such fields as soil microbiology, ecology, medicine and anthropology.三、非谓语问题：What's the chance of there being a general ele...