英语语法中有一种句子结构是主句过去完成时加从句,那么在这种情况下,从句应该是什么时态呢?
首先,我们需要知道什么是主句过去完成时。主句过去完成时的结构是由had + 过去分词构成,表示过去某个时间点或时间段之前已经完成了某项动作或状态。例如:
- He had finished his homework before he went to bed.(他在睡觉前已经完成了作业。)
- They had been married for five years before they had their first child.(他们在有了第一个孩子之前已经结婚五年了。)
接下来,我们需要明确从句应该是什么时态。一般来说,从句的时态应该和它所描述的动作或状态发生的时间有关。如果从句所描述的动作或状态发生在主句过去完成时之前,那么从句应该用过去完成时。例如:
- He said that he had finished his homework before he went to bed.(他说他在睡觉前已经完成了作业。)
- They told me that they had been married for five years before they had their first child.(他们告诉我,在有了第一个孩子之前他们已经结婚五年了。)
如果从句所描述的动作或状态发生在主句过去完成时之后,那么从句应该用过去完成进行时。例如:
- He said that he had been studying English for two hours before he took a break.(他说他在休息之前已经学习了两个小时的英语。)
- They told me that they had been living in London for three years before they moved to New York.(他们告诉我,在搬到纽约之前他们已经在伦敦生活了三年。)
总之,在主句过去完成时加从句的情况下,从句的时态应该根据它所描述的动作或状态发生的时间来确定,可以是过去完成时或过去完成进行时。
希望这篇文章能够帮助大家更好地理解主句过去完成时和从句时态的关系。