1.为什么be done中的be是助动词？而have been done却是系动词？
2.我们知道主系表结构可以倒装。但是表示被动饿也叫主系表结构吗？比如:the picture is fixed on the wall可以说成fixed on the wall is the picture.但是前面那个is是助动词，不是主...
...只修饰句子的一部分吗？In China, everyone has the opportunity to be vaccinated , but that's
not the case in America.句中In China从逻辑上讲是修饰第二个逗号前面的everyone has the
opportunity to be vaccinated, 但是从语法上讲这种提到前面的属于批注性状语...
She stood there motionless, her eyes filled with tears—whether of shame, frustration, or grief it was difficult to tell. 请问老师句中的of是什么成分，什么意思？此句中的 of 是否是省略后的结构？
But last year, the British competitor Chris Boardman set world records while winning titles in the Olympic cycling pursuit events on a custom-built, carbon-fibre bicycle with lower weight and wind resistance than standard models.
Over 60% of the land area is moutains,21% is covered with production forest lands of which there are some consider the largest in the world.老师，帮我分析一下句子成分。这句话的先行词是谁？
Over the past few months it has been working hard. With the help of media consultants, to play down its cosy reputation in favour of something more academic and serious.这句话该如何分析?
...多。”In addition, far more Japanese workers expressed dissatisfaction with their jobs thandid their counterparts in the 10 other countries surveyed.问：用“than their counterparts in the 10 other countries surveyed.”不行吗？为什么要用did ?而且还能放在比较状语从句...
So I was thinking
about all sorts of mechanical ways of how we can live more in tune with the
environment rather than to exploit it?请问老师这里的of how 构成的是什么从句?
A combination of Frontier and Spirit, especially with the hundreds of
new Airbus jets both firms have on order, might have increased that share
significantly, making it as disruptive as its European counterparts.