If necessary (=If it is necessary), ring me at home. 如果必要，可往我家里打电话。
这里的 if necessary 是个省略句，它等于 if it is necessary，我想问，可以等于 if youare necessary 吗？因为后面是祈使句，省略的主语应该是 you，对不对？
...sed opportunities.Say you intend to watch a football match but the tickets are expensive and it will take youa couple of hours to get to and from the stadium. Why not, you might reason, watch the game from home and use the leftover money and time to have dinner with friends? This--- the alternative...
...th me . 改写为：when he laughed a lot，he was with me. When I was at school,I loved history.改写为I was at school,when I loved history.请问老师 自己改写的句子是否正确 不需要两个句子句意一样， 但从语法角度？
...ied in the battle. 5. He is lost in thought, oblivious
of what his fellows are talking about. 6. What he did has nothing to do
with her. 7. She couldn’t fall asleep,
because her daughter’s sickness on her mind. 8. This matter has been on my
mind for a long time. 9. He enjoys these parties, and
l...
请问曹老师，以下两个句子意义是否相同：1. You should be
careful when you cross the road. 2. You should be
careful when youare crossing the road. 我认为when此时应理解为during the time，其后的持续性动词应使用进行体。但同时此句表达是一种习惯...
...，where,when引导的从句我一直感觉充当成分。Stay where youare. (where做表语）Make marks where you have questions. (where在从句中做状语，表示“...的地点”）When you grow up, you can do it by yourself. (when也在从句中做状语。表示“...的时间”）where,...
Do you know _______.A. how many populations there are in the world B. how much population there is in the world C. how many the population of the world is D. What the population of the world is这题答案是 D，不是很清楚ABC的考点以及错误的原因，谢谢老师！
And as for the bananas, researchers also found ahigh percentage of fossils from banana plants in sediment samples dating from about 7,000 years ago—proof that bananas were deliberately planted.我想问下Proof是前面整句话的同位词吗？ 成分上很孤立啊
...份美好的回忆。这是我在网上看到的，翻译是这样：There are several small souvenirs, each with a story behind it, which are treasured as so many happy memories.里面的 each with a story behind it 这是什么结构，很少遇到，这是不是叫做独立主格？如果我翻...
Reader's Digest看到这样一句话：Where at first all that was demanded of him in school was a sign, now Matthew's teachers wanted a sign plus a vocalization of the word the sign represented.请问老师，此处的where 该怎么理解？是第一句中主语从句的一部分吗？