Unit3 Places of interest-grammar学案
过去完成时有两种基本用法：“段”的用法和“点”的用法。
1. “段”的用法——表示一个动作或状态在过去某一时刻之前开始，一直延续到这一过去时刻，甚至还可能继续延续下去(To express duration up to or into a certain time in the past)。这种用法通常见于延续动词作谓语，且常和表示时间段的状语连用。例如：
She looked rather pale. She had been ill for some time.
When we got to the cinema, the film had been on for half an hour.
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