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回答:1. 从属连词as(因为)可以引导原因状语从句,但它作介词时,它的意思是“作为”。 例如:
As he was ill yesterday, he didn't come to school.
We treat her as our daughter.
2. for 表示 原因时,既可以接名词(短语),也可以接句子(for被视为并列连词,置于句中)。例如:
He scolded me for my coming late.
He doesn't get any schooling, for his family is very poor.
3. since(因为)可以引导原因状语从句,但它作介词接名词时表示“自从”的意思。例如:
Tom must be out since the light in his room is not on.
I haven't seen him since 2018.
4. because 和now that均可引导原因状语从句,但不能作为介词来用。because of是介词短语,可以后接名词。例如:
Because / Now that his family was poor , he often got hungry.
Because of stealing things he often got beaten.