They hoped he would own up to having told the lie.I think that's what he said, but I can't swear to having heard him correctly.这两句话中的tell和hear为什么要用现在完成时？不能直接就telling, hearing吗？是不是在介词后面的动词只能用现在完成时表示过...
Aluminum（铝） remained unknown until the 19th century，because nowhere in nature is it found free，owing to its always being combined with other elements，most commonly with oxygen，for which it has a strong affinity.（亲和力）最后一句为什么不直接for it has...变成原因状...
Iconoclasts, either because they were born that way or through learning, have found ways to work around the perceptual shortcuts that plague most people. 阴影部分：是插入语吗？还是状语从句啊？ ...
老师您好，我有一个疑问，比如：The broken cup is mine.这个broken表被动、完成，是先于谓语is的。但是举个例子，He faced with so many difficulties looks worried，这个faced with so
many difficulties是he的定语，那么faced with so many difficulties不是一种...
She
are a good fit for you.这里的for介词片语是作副词用是么?a good fit for 中的 for 介词片语是作副词还是形容词片语，为什么呢?Tell
what makes you a good fit for the job. 这个for 引导的介词片语也是作副词用的是么，还是形容词修饰fit?
词典是有一种动词的释义VERB 带领; 引领; 护送If you are shepherded somewhere, someone takes you there to make sure that you arrive at the right place safely.这种主句和从句都是一般现在时，和通常的“主将从现”不同，这是哪一种条件句呢？
...法规律，但是感觉后者才更符合表意。同样的， She likes the black dog? 对定语black划线，应该用Which dog does
she like? 但是有些人坚持只要是对颜色提问就用What color，那么就变成了What color dog dose
she like? 请哪位大神给个有根据的...
still 放在句子中间的比较多。如：
The rule is still in effect. 这条规则仍然有效。
It’s a wonder that he is still alive. 他还活着，真是奇迹。
但今天看到一个将 still 放在句首的例子：
Day after day went by, and still no message arrived. ...
...pecial session on China that an increasingly prosperous China will provide the world with more "Chinese opportunities" in development, namely market opportunities, investment opportunities, growth opportunities and cooperation opportunities.他在“中国专场”活动上表示，一个...