The sun rose in the east yesterday
He was my father yesterday
I had a cat yesterday
是否都要用一般目前时假如目前这类事物都存在的话，譬如第一个客观真理，第二他还是我父亲，我目前还有只猫。或者省略了yesterday是否要用一般目前时，假如有语境明确说过去的事把yesterday去掉是否也可以用一般过去时，不是代表否定目前的意思，由于过去式和目前没关系是吗？
that is the best thing I have seen
that was the best thing I have seen 又的不同之处？
第一我感觉这类是你一个人造的句子。
The sun rose in the east yesterday. 没问题，描写昨天的状况。
He was my father yesterday. 独立看这句有问题。英语里没这个说法。如： Who was the man I saw yesterday? He was my father. 如此倒是可以。你的句子在特殊语境大概。倘若你今天和父亲签了断绝父子关系协议，你在法庭辩论你这么说可以。He was my father yesterday, not today. 我非常难想出其他适合的语境。
that is the best thing I have seen 一般have 后+ever, 这句没问题。
that was the best thing I have seen , 这句有问题，这样的情况要用had ever seen 除非句尾加上in my life. 可以用have ever seen in my life.
