赞 mygenius1127 幼苗
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since 有两个意思,
1、解释为：自从.（到此刻）时,since引导的句子时态是一般过去时态,主句是现在完成时态,如：He has been a teacher since it was three years ago
He has been a teacher 主句,完成时态,since it was three years ago从句一般过去时态
2、解释为：因为,由于的时候,since引导的句子的时态很多遍,有语境决定
如：He won a prize for the competition since he had spent so much on it 等
希望能帮到您
1、解释为：自从.（到此刻）时,since引导的句子时态是一般过去时态,主句是现在完成时态,如：He has been a teacher since it was three years ago
He has been a teacher 主句,完成时态,since it was three years ago从句一般过去时态
2、解释为：因为,由于的时候,since引导的句子的时态很多遍,有语境决定
如：He won a prize for the competition since he had spent so much on it 等
希望能帮到您
1年前
10
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你能帮帮他们吗