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...
Hearing my story, many students followed with their own stories of
heads, arms, fingers stuck in places they shouldn't be. 句中,最后的be如何理解?是省略了where的定语从句动词吗?这里be可以换为stay吗?
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?