have you know for 4 year? 这句话是过去式还是现在完成时

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• 一般过去时和现在完成时时间状语北京西城区一摸题28.—Hi,Nancy ,I didn’t know you had come back .So have you graduated from college?—Yes .I French for four years in Nanjing.A．have studied B．had studied C．studied D．am studying不是说有for+段时间作时间状语都得用完成时吗?还是说没那么绝对,要具体问题具体分析.这里的4 years由题意可知是明确的过去的一段时间,故用一般时.
• have you know for 4 year? 这句话是过去式还是现在完成时
• 完成时后面是接什么时态啊现在完成时后面是接过去式还是过去分词啊.比如：as you have already seen in the section A,I have a good academic record.中这句话have already 后面是跟的seen,也就是过去分词,可为什么在一些句子中是跟的过去式呢.迷茫了,到底完成时态后面的句子成分是这么个用法呢
• I don't know much about us at last year ,but I'm have a lot of teardrop now.
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