being doneto be doneto have donehaving doneto be doingdoing以上这些在做状语的时候分别表示怎样的状态？to have done通常在句中表示发生在谓语动作之前的动作？having done通常在句首做独立状语？表示发生在谓语之前的动作？除了doing表主动之...
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？
—Why did you call yesterday? I was out then.—To tell you I ____ a souvenir for you.A.bought B.had boughtThe two choices confuse me quite a bit. I'm wondering which sounds better to you?
Chinese started to use chopsticks a long time ago, which gradually became a part of Chinese life.请教老师，1. which指代的是started to use chopsticks还是use chopsticks?2. 用became还是用has become，哪一个更恰当？谢谢老师。
请问instructing him...在句子中做什么成分？为什么不是用to instruct him?
The editor at once sent the journalist a fax instructing him to find out the exact number of steps....
While that eased previous eligibility rules, which required freelancers to work for 52 weeks before becoming eligible, it would have required all freelancers not yet eligible for benefits to start the waiting period over again on Jan. 1.
麻烦请老师分析句子及翻译!
...ent Donald Trump's big executive power move ostensibly meant to support laid-off workers and stimulate the economy is already mired in confusion that threatens to leave millions of jobless Americans waiting in vain for help from Washington.请问句子为什么有三个动词...
Quick
to claim credit, the prime minister is nowhere to seen when things go wrong这是《经济学人》的一篇文章副标题。主标题是：As
a second wave devastates India, Narendra Modi vanishes标题里的be可以省略，但这里省略be有点怪异。老师们怎么看？感谢！