...单一的动作。我想了一些表述:I have knocked at the door three times.I have been knocking at the door three times.(但是进行时态又不能和表示次数的状语连用)I knocked at the door three times.请问您上面几种表述有对的吗?
The Amazon rainforest is smaller now
than was 50 years ago.请问这里的 than was 是什么用法?难道不应该是 than it was 吗?The Amazon rainforest is smaller now than it was 50 years ago.附相关截图:以上截图来自译林版高中英语新教材必修第三册第1单元(p7)...
有些动词(如 think, believe 等)后接宾语从句时,若宾语从句是否定的,则通常把宾语从句的否定转移到主句上,如:I don’t think that he is clever. 我认为他不聪明。I don’t believe that he will come. 我想信他不会来。请问这种否定转移...