英语翻译问题？

Question

has后面为啥是become而不是became？

Answer 1

has＋现在分词是动词的现在完成时时态，这里的has become没有错，动词become的过去式是became，但它的过去分词是become。请看下面，点击放大：

Answer 2

因为has后加过去分词表示现在完成时，而become的过去式是became，而过去分词是become. 特殊单词的过去分词形式需要特殊记忆。

Answer 3

回答如下：
因为have / has + become是现在完成时。现在完成时的构成是：助动词have / has + 过去分词。动词原形become的过去式是became，过去分词是become，故助动词has后面要跟过去分词become。类似例子：
He has gone to Beijing.
We have finished the work.
He has been there twice.

Answer 4

时态的原因，这里的has done（现在完成时），表示动作到现在为止已经完成或刚刚完成，强调对现在产生的影响，而become是动词原形，become的过去分词是became，因此需要用has became

Answer 5

因为has后面要加become的完成时，become的完成时还是become。
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