To briefly answer your question: As you say, the perfect tense is used to relate two actions or imply a time relationship between now and some action. "When I was younger" is an …
(1a) Jack was good-looking when he was young. (1b) Jack was good-looking when young. Yes, (1b) is fine. It's an example of ellipsis of the subject pronoun "he" and the …
He (play) football regularly for many years when he was young. 语意为：当他年轻时，他长达很多年定期地去踢足球。 根据时间状语when he was young和程度副词regular. He …
We are also told that Abraham Lincoln_____ A．never cared much for reading B．did much reading when he was young C．never had much chance to read D．became an …
When he was young, he _____ with his grandparents. A lives. B live. C lived. D will live
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