新概念2 第一课问题 I did not enjoy it（这里为什么用did,不可以用could？）

Last week I went to the theatre. I had a very good seat. The play was very interesting. I did not enjoy it. A young man and a young woman were sitting behind me. They were talking loudly. I got very angry. I could not hear the actors. I turned round. I looked at the man and the woman angrily. They did not pay any attention. In the end, I could not bear it. I turned round again. ‘I can't hear a word!’ I said angrily.
‘It's none of your business, ’ the young man said rudely. ‘This is a private conversation!’

I could not hear the actors（这里为什么用could，不能用did？actor为什么加S ）
I can't hear a word（这里为什么用can，不用could？）

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I could not hear the actors. 我听不到演员们说话. 演员不止握启一个,所以用复塌尺数,加s
由于这是在叙述过去发生的事,所以用could. 表示一种能力, could not 就是不能. 由于They were talking loudly 他们大声讲话,导致我无法听到.
而用did not的话,就表示主观上的不听.

I can't hear a word 这是直接引语了,就是发生在当时的情景里,用的一般现在时.

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用could 是因为文章里的主要时态是过去时，用could还想表达的是不能听到，而用did的话则表腔哪升示的是没有听到，两者意思很明伍老显不同。
i can't hear a word这句话用了引号，表示的是当时所说的话，所以用的是一般时态。
总体上，时间里的区缓带别，楼主要注意的是文章描述所用的时态和引用的时态是有所不同的。

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