I saw a big black dog when I came in

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I saw a big black dog when I came in
When 引导的时间壮语从句,主句什么时候用过去式.

1.表示有规律的,都用一般现在时
2.表示将来的事情,用主将从现（主句将来时,从句一般现在时）
3.表示过去两个有先后的动作,都用过去式
4.表示一个动作正在进行（过去进行时）,另一个动作插入（过去式）

When I came in,I saw him ___ in a chair deep in thought When I came in,I saw him ___in a chair deep in thought.选项有A. When i came in ,I saw him _______in a chair deep in thought I saw a dog in the road when i was driving to london i saw a boy _____(play) football in the street when i came b I saw there__a pair of jeans on the bed when I came in.A.was I saw Gloria _____ (singer)in the next room when I came in. I saw an old man ___ in the entrance hall when I came to the when i came back,i saw Tom（）adiary in her room When I came into the room,I saw him _______ his homework.A、d Yesterday,when I came home,I saw Mom ____. when i came back,i saw Tom（）adiary