初中until before wnlessforwhenwhile 一般前后什么时态

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• 初中until before wnlessforwhenwhile 一般前后什么时态
• 初中until before wnlessforwhenwhile 一般前后什么时态
• your backage_____ here until you come back,so enjoy shopping here.A will be kept B has been keptuntil用在从句中,从句前后时态应该一致.虽然我也觉得好像应该选A ,但是从句后面是一般现在时,前面为什么不选B,用现在完成时呢?
• 连词before,until,while,as,since,as soon as,after的用法时态方面的 例如 主句 是 一般现在时 从句是什么时态?还有别的时态
• before until since分别前后用于什么时态
• before until since分别前后用于什么时态是否和when的用法相似
• before前后的时态,我们老师说主句过去,从句过去,或主句将来,从句一般现在为什么我看见过主句过去完成,从句过去的啊例：Every part had been searched for before the policemen arrived.
• before用于什么时态
• 关于before until since 等的疑问Few people will pay attention to their health ( 　）they get disease.答案说是until 我想问before能用吗?We were chatting on the net ( ) the light went out..答案是when~我不知道能不能用until~还有这句翻一下~Three years had passed( )i knew it答案是before 能不能用when...