新概念3中的问题I had come ten miles since leaving the town.这句中为什么用l

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新概念3中的问题
I had come ten miles since leaving the town.这句中为什么用leaving?
I should be looking at farms and cottages in a valley.这句为什么用be looking at?

leaving 在此处用法为非谓语做状语,since 从句和主句的主语都是i 所以从句省略了主语i,i 和leave 之间是主动关系（主谓关系）所以用v-ing
be looking at 表示正在看,此处用法为情态动词的现在进行时：情态动词+be+v-ing

My village is ten miles ( ) the nearest town I live three miles ___ west of the town. the new town will cover ten （） A 、miles B、 squares C、mile sq i knew that my turn had come.这是新概念二上面的一句话,为什么用had+动词原型这个用法? since 急it was ten years since i had left my hometown.leave是终 I didn't know you had come back 中的had come 不该用have came back it's three miles from jimmy's home to the town.(改为同义句) i ___ 怎样理解I have had the bike for two years/since two years ago中的h mr johnson had a shop in the center of the town.neariy ten p I knew that my turn had come为什么用knew ten years ___(pass)since I graduated from the university可以用p I come to New York when i was ten and _____here ever since.