Why were you late for class this morning?I was del

问题补充：

Why were you late for class this morning?I was delayed by()heavy traffic的什么形式?

答案：

回答：heavy traffic 是名词短语,意为“拥挤的交通”,在此作delay动作执行者.

此句改为主动语态为：

Why were you late for class this morning?The heavy traffic delayed me.

======以下答案可供参考======

供参考答案1:

heavy traffic就是：形容词+名词的结构

意思是：交通堵塞

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供参考答案2:

可以加冠词the,交通是抽象的，不可数没有复数