一般现在时与一般过去时的混用

As the system makes the assessments, the facial regions that were most helpful in the determination are highlighted and made available for doctors to view.

这句话的are为什么不用were(that后面是makes，and后面又是were，有点乱了)?

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mikee 2021-06-02 00:04

As the system makes its assessments, the facial regions that were most helpful in the determination are highlighted and made available for doctors to view.

如果是之前发生的事，当然要用were。

黎反修 - 英语翻译（已退休） 2021-06-02 10:20

擅长：数词用法,存在句,英语考试

As the system makes the assessments, the facial regions that were most helpful in the determination are highlighted and made available for doctors to view.

= As the system makes the assessments, the facial regions that were most helpful in the determination are highlighted and ( are) made available for doctors to view.

这个句子是一个复合句：As the system makes the assessments, the facial regions ... are highlighted and ( are) made available for doctors to view.是主句， are highlighted 和 ( are) made 是并列的谓语动词（被动语态）；that were most helpful in the determination 是定语从句，先行词是 the facial regions，因为 the determination 是过去的事情，所以定语从句中的系动词用过去时 were 。

主句中的

makes 和 are 都是一般现在时，表示一般的情况，所以不能用过去时。

一般现在时与一般过去时的混用

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