主从句的时态问题He said he would not give me a present unless I succeed in doing the experiment.说是一般过去时代替过去将来时,但是“succeed'为一般现在时

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主从句的时态问题He said he would not give me a present unless I succeed in doing the experiment.说是一般过去时代替过去将来时,但是“succeed'为一般现在时
主从句的时态问题
He said he would not give me a present unless I succeed in doing the experiment.说是一般过去时代替过去将来时,但是“succeed'
为一般现在时

主从句的时态问题He said he would not give me a present unless I succeed in doing the experiment.说是一般过去时代替过去将来时,但是“succeed'为一般现在时
unless引导的是条件状语分句.
当unless分句表示真实条件时,通常可以if...not代替.
也就是说,此句可换为:he said he would not give me a present if I not succeed in doing the experiment.
因此此句是真实条件句,
真实条件句有两种基本形式:
(If)simple present + (Main)shall /will/can/may等 +不定式,
(If)simple present + (Main)imperative
由此可以看出,当unless分句表示真实条件时,基本上是用现在时

用过去时是虚拟语气,用现在时为一般的假设

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