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by the end和by the time的区别？
the end和by the time的区别？
By the time表示“截止至...为止”
1.表示将来的时间.
主句用将来完成时,而从句用一般现在时来表示将来的动作.
如:I will have finishied the work by the time my father comes back.
2.表示过去的时间.
主句用过去完成时,而从句用一般过去时.
如：He had built a lab for himself by the time he was 12 years old.
by the end of表示.“..结束时”
“到.末”,多指时间,常用于完成时态,也用于将来时态.
By the end of last month they had planted 10,000 trees.
如：到上个月月底他们已经栽了一万棵树.
by the year引导什么状语？
by the year是“by 时间点”构成的介词短语,表示“到……时候”。这一结构通常用于完成时态的句中作时间状语。
(1)by 过去时间点,主语 谓语(过去完成时态) 宾语……
(2)by 现在时间点，主语 谓语(现在完成时态)十宾语……
(3)by 将来时间点,主语 谓语(将来完成时态/将来时态)十宾语……
by the time sb.did sth.，主语 had done sth
(4)bythe time sth.，主语 will have done sth.
例句:
(1)We had learned 3,000 words by the end of last term.
到上学期末,我们已经学了3000个单词了。
(2)By now,five villagers have been attacked by the hairy creature.
到现在为止,已经有5个村民被那个多毛动物袭击了。
(3)By the time Dale was a senior,he had on every top honor in speech.
当戴尔是一个高中生的时候,他在演讲上已赢得了每一项最高荣誉。