在新概念三24课中有这么一句话：But George was unsympathetic. ‘ Oh, that,' he said with a smile as if he were talking about an old friend. ‘ That's Sebastian. You forget that I was a medical student once upon a time.'请问这里为什么不用过去完成时 as if he had...
Most children grow out of tantrums by the time they’re three. I’ll be in my grave by the time that happens! 这里为什么一句用will，一句不用will，有什么规律可循吗？By the time we arrived, the meeting was over.我知道 was over 表示一种状态，但是...
...from an increase of 1% to a rise of
2% in 2019: the fastest pace of growth since 2000.请问老师，from an increase of 1% to a rise of 2% in 2019是状语吗？如果是，from前面可以不加逗号吗？the fastest pace of growth since 2000是同位语吗？是什么的同位语？
I was the first Western TV reporter_____ (permit) to film a special unit caring for pandas rescued from starvation in the wild. 答案：permitted. 问题：请问可以填写to be permitted吗？是否还能填写to have been permitted? 语法书上规定 first 修饰名词时，常常...
现在完成时可以用在条件或时间状语从句中, 表示将来某个时刻之前已经完成的动作。e.g. I’ll go home as soon as I have finished my homework. Please lend me that book if you have finished reading it. 怎么理解呢...
...随便写个句子：
The birth rate stands at 1% this year，the lowest since 2000.
对the lowest的理解应该是（being）the lowest呢还是（which is）the lowest？哪个合适？（我认为两个都合适）
如果在改改主语He said that the birth rate stands at 1% this year，th...
...语法书中说when和where前也可以有介词，when前可以与from、since、after等引导定语从句，where前可以与from引导定从：A. She went to America two years ago,since when I haven't heard from her any more.B. She climbed up to the top of the hill,from where she could have ...
尊敬的曹老师您好，请问：1. She has already finished her homework every time I ask her for dinner.句子中的习惯是否和您之前所讲的完成体未完成用法中的习惯不同。前者：习惯是总是完成作业，后者：习惯从过去持续到现在。如果不同，请...
Since everything develops, we have to make an adjustment to the changing situation. Since everything develops, we have to make adjustments to the changing situation.哪个更合适？
我知道It’s the first time that…的从句时态要用现在完成时。如：It’s the first time he has come here. 这是他第一次来这儿。同时也知道It was the first time that…的从句时态要用过去完成时。如：It was the first time that I had seen him. 那是我第一...
How do you make sure you have deleted something after you read it?-来自美剧摩登家庭you have deleted sth after...这里用have deleted表示发生在主句谓语make sure 之前，对吗？时间状语从句after you read it,这里的read 是过去式吗？you read it 发生再have deleted ...