sαy的过去式和第三人称

say是动词，说的意思，say的三单是says，过去式是said.says用于一般现在时，主语是第三人称单数时，例如He says that he is a student.他说他是个学生。

said用于一般过去时，例如He said he would go shopping with his mother.他说他要和他妈妈去购物。