这个句子是某美国报纸2015年时的新闻报道语句：By 2019, they are projected to have fallen off by roughly a third since their peak in 2009.我知道这句话的意思应该是: By 2019, they are projected to fall off by roughly a third since their peak in 2009.为什么这个地方...
He will start circling soon and then I must work on him. I wonder what started him so suddenly ?Could it have been hunger that made desperate, or was he frieightened by something in the night ?（海明威老人与海）。不知道鱼为什么惊跳起来？我查了所有的词典，都说当start...
...用，如she can swim中的swim，或带to，如she likes to swim） the basic form of a verb such as be or run . In English, an infinitive is used by itself, as is swim in She can swim , or with to as in She likes to swim
... a decision. （that可以省略）Seeing (that) he is determined to carry the project through, I helped
him.（that可以省略）老师们，比如以上引导状语从句的连词加的that，这个that是什么意思呢，这些连词本来不就可以引导句子吗，为什么还要加that？
...nd hard it till 2 P.M. Two gourds of beer divided between
old and young in the evening. Women working in their gardens normally.此文出自《全球通史》中一名人类学家对于食物采集部落1933年9月3号的行为记录。看是看得懂的，但是不明白为何这样行文，限制...
...s. 印度近年来经历了很多政治变动。
Unemployment among the over forties has risen sharply in recent years. 最近几年 40 岁以上的人的失业率大幅上升。
归纳起来，in recent years 通常都连用些什么时态呢？谢谢！
... 可以修饰形容词的原级，比如 accessible, available 等，如：The castle is easily accessible by road.但《朗文》只给出了 accessible, available 这两个形容词，其余的就用“等等”省掉了，在此不知能否请专家老师帮我归纳一下有关的用法，比如...
In the south part of China, many people even go to work by boat. Because water is around their _______(house).这里的 house 必须是用复数吗？我觉的单数也可以，表示他们各自的房子。另外，句子里的 work 是动词词性吗？
...！用括号内单词或词组的正确形式填空：Before you hand in the paper, make sure you _______ (not make) any mistakes in it.答案是: don't make我不能理解，为什么是 don't make ? 为什么不可以是 didn't make 或 won't make 呢？我想知道为什么...