have there been serious attempts to是什么时态？怎么理解？

Only in the past few years have there been serious attempts to test these ideas.

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分类：词法问题

最佳答案 2020-09-07 13:11

Only in the past few years位于句首，句子谓语要局部倒装，所以there have been应改为have there been。请参考网页：

http://www.yygrammar.com/Article/200811/728.html

there be结构根据需要可用现在完成时态。例如：

There have been strange happenings here lately. 这儿最近发生了一些怪事。《牛津高阶英汉双解词典》

There have been around 15 attempts from outside Idaho to penetrate the market.

已有约十五次从爱达荷州以外打入该市场的企图。《柯林斯高阶英汉双解词典》

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曾克辉 -

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刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编 1秒前

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Only in the past few years have there been serious attempts to test these ideas.
这是 there be 存在句的现在完成时。因倒装把 have 提前了。去掉Only ，正常语序为：
In the past few years there have been serious attempts to test these ideas.

have there been serious attempts to是什么时态？怎么理解？

最佳答案 2020-09-07 13:11

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