The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量

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The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量
The production of grain has been increased by four times this year.今年粮食产量增加了4倍
这个句子用了现在完成时
下面这个句子:
The grain output is 8
percent higher this year than that of last year.今年比去年粮食产量增加8%
为什么不需要?
还有在书写的时候数字直接写 不用eight这样写吗?
应该完成时被动语态

The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量
时态问题:第一个句子的动词用的是increase,增长,是一个已经完成的动作,所以用完成时;第二个句子直接用系动词is,表示现在的状态,所以用现在时.俩都对,两种方式都可以用.

书写问题:对,欧美国家一般也用阿拉伯数字,所以直接写没问题,但特别正式或者需要准确说明的文件一般都用英文写数字,而不用阿拉伯数字.

第一个句子表示所描述的事情已经完成;
第二个只是陈述一件事情,不带任何感情。
在选择上,要根据情景需要选择不同的表达方式。
对于写作时是否将数字转化成相应的英文,视自己的写作习惯和语感吧。

前句完成时表示已经完成
后句因为是和去年的比较所以用现在时

没有规定写作时数字的写法

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