.since yesterday前面用现在完成时,还是过去完成时?

.since yesterday前面用现在完成时,还是过去完成时? yesterday前面用什么介词 Tom came here yesterday 用since改写句子TOM ____ ____ here since yesterday I haven't seen her since yesterday .划线部分since 用a few mintes ago 代替 可以告诉我months,years,ages,前面用for还是since? 现完练习.He has stayed home since the day before yesterdayHe has stayed home since the day before yesterday.the day before yesterday划线部分提问 I have been sick since yesterday.中have been 是什么是时态为什么要用been. ha has had a bad cold since the day before yesterday.用英语解释句子~ the worst day since yesterday 歌词 google bug since yesterday英语什么意思 He has been here since yesterday.(对划线部分提问)since yesterday为划线部分 我自幼喜爱绘画,用英语怎么说用since前面还是一般现在时可以的么 since和for后面接时间,那前面的时态是不是都用现在完成时? we don't know what has happened since yesterday since 不是跟延续性动词吗为什么用has happened是不是happen也可做延续性的， 用正确的时态改写句子：例句：He __has gone___ to Silbury yesterday.改动以后：He went to Silbury yesterday.1.She ___was__ abroad since last January. I saw Janson yesterday.We haven't seen each other since we left Beijing.这句话用现在完成时对吗?为什么这句话却用过去完成时I saw Li Lei yesterday.We hadn't seen each other since I left Beijing. I met Tom yesterday.We hadn't seen each other since we left Sydney in 1990.这里为什么用过去完成时, he has been here since yesterday对划he has been here since yesterday对划线部分提问.划线的是since yesterday.