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：当since表示时间，谓语动词的时候，since的时态应该怎么表达?下面我们一起看看这篇《since谓语动词的时态》。
一般情况下，since短语和since从句表示时间时，通常句子(或主句)谓语动词用完成时。但是，在以下情况下，since短语与since从句表示时间时，句子(或主句)谓语动词可以不用完成时：
(1)句子(或主句)谓主动词与情态动词连用时，不用完成时。比如：
Since the doctor operated on his throat, the boy can speak clearly.
自从医生给这男孩做过喉部手术后，他就能清楚地讲话了。
He can only stay in bed since he fell ill.
他自从生病后，就一直卧床不起了。
(2)当since引出的状语修饰一个后置定语从句时，句子(或主语)不用完成时。比如：
People were evacuated from the territories occupied (=which had been occupied) since the beginning of the war.
人们被迫撤出了战争开始以来就被占领的领土。
The couple had no photo of themselves taken (=which had been taken) since they got married.
那对夫妻自从结婚后就没照过相。
(3)句子(或主句)谓语是be动词，并且表示时间概念时，句子(或主句)谓语动词用一般现在时比用现在完成时普遍。比如：
It is (has been) three years since he joined the army.
他参军已经3年了。
It is (has been) a long time since we parted.
我们已分别久了。
(4)有时句子(或主句)谓语动词be也可用过去式，此时since从句的谓语动词常用过去完成时。比如：
It was two years since we had parted.
我们分手有2年了。
It was ages since I had had my last meat.
我前一顿饭已经吃过好长时间了。
(5)当所述是事实，或一种长期不变的习惯时，句子(或主句)谓语动词常用一般现在时。比如：
Ever sincehe recovered, he goes for an outing every other morning.
自从他康复后，每隔一天早晨他都要到郊外远足一次。
My mother feels a lot better since she took the medicine.
自从我母亲服过那药后，她感觉好多了。
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