作业帮since作为原因讲的用法?
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since作为原因讲的用法?
请举例
请举例
since是一个用法极活跃的词,现归纳如下：
1. 用作介词,意思是“从……以来；自从”,常与完成时连用. I haven't heard from her since last year. 自去年以来我没有收到她的来信.
2. 用作副词,意思是“从那时以来”.
I saw him last year, but we haven't met since. 我在去年见到过他,从那以后我们就没有见面. C&g {:]#B
3. 用作连词,意思是“从……以来；由于；既然”等. He has been ill since I saw him last. 从上次我见他以来,他一直在生病.
Since you have finished the work, let's go to the park. 既然你已把工作做完了,我们去公园吧.
since表示原因时,语气比because弱,表示的原因是对方已知的,所说明的有时不是根本的或直接的原因,是附带的原因,一般把它译成“既然；鉴于”.since引导的从句往往放在主句之前.例如：
The fisherman said,“Since I must die, I must... ” 渔夫说：“既然我非死不可,那我就死好了……”
【注意】
①在现在完成时中,since后接时间点或从句,而for只接时间段,可以说since 1999, since six o'clock, since we came here last year; for two days, for a long time, for a week等,但不能说成since two years, for last week等.
②在“It is+some time+since-从句(过去时)”结构中,用“It is...”比用“It has been...”更为常用.而且在该结构中since-从句不能用否定式.比较： It's long time since you didn't come to see me. (×) It's long time since you came to see me. (√)
③since短语通常不能同一般现在时连用.比较：
He is here since five o'clock. (×)
He has been here since five o'clock. (√) I
但当句子主语为it时,或句子所表示的是一种客观事实时,含since短语的句子谓语也可以采用一般现在时.
It's a long time since breakfast. 早饭之后已有多时了.
Ever since then, the bat comes out only at night. 从那时起,蝙蝠只在晚间出来.
1. 用作介词,意思是“从……以来；自从”,常与完成时连用. I haven't heard from her since last year. 自去年以来我没有收到她的来信.
2. 用作副词,意思是“从那时以来”.
I saw him last year, but we haven't met since. 我在去年见到过他,从那以后我们就没有见面. C&g {:]#B
3. 用作连词,意思是“从……以来；由于；既然”等. He has been ill since I saw him last. 从上次我见他以来,他一直在生病.
Since you have finished the work, let's go to the park. 既然你已把工作做完了,我们去公园吧.
since表示原因时,语气比because弱,表示的原因是对方已知的,所说明的有时不是根本的或直接的原因,是附带的原因,一般把它译成“既然；鉴于”.since引导的从句往往放在主句之前.例如：
The fisherman said,“Since I must die, I must... ” 渔夫说：“既然我非死不可,那我就死好了……”
【注意】
①在现在完成时中,since后接时间点或从句,而for只接时间段,可以说since 1999, since six o'clock, since we came here last year; for two days, for a long time, for a week等,但不能说成since two years, for last week等.
②在“It is+some time+since-从句(过去时)”结构中,用“It is...”比用“It has been...”更为常用.而且在该结构中since-从句不能用否定式.比较： It's long time since you didn't come to see me. (×) It's long time since you came to see me. (√)
③since短语通常不能同一般现在时连用.比较：
He is here since five o'clock. (×)
He has been here since five o'clock. (√) I
但当句子主语为it时,或句子所表示的是一种客观事实时,含since短语的句子谓语也可以采用一般现在时.
It's a long time since breakfast. 早饭之后已有多时了.
Ever since then, the bat comes out only at night. 从那时起,蝙蝠只在晚间出来.