Your picture is wonderful!Iworked for 8 hours___I finished it.用before 不是就表过去完成时了么?when

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Yourpictureiswonderful!Iworkedfor8hours___Ifinishedit.用before不是就表过去完成时了么?whenYourpictureiswonderful!

Your picture is wonderful!Iworked for 8 hours___I finished it.用before 不是就表过去完成时了么?when
Your picture is wonderful!Iworked for 8 hours___I finished it.
用before 不是就表过去完成时了么?when

Your picture is wonderful!Iworked for 8 hours___I finished it.用before 不是就表过去完成时了么?when
It is + 时间点 + when… 的意思是“当……的时候时间是……”.
It is + 时间段 + before… 的意思是“在……之前有一段时间”.
请看以下用例:
It was past one o’clock when he came in.他回来时已经一点多了.
It won’t be long before they understand each other.过不了多久他们就会互相了解的.