一般来说,情态动词后,是加动词原形的,但你说的这种情况也有、、、、
举个例子：
Fredierick William I,the king of prussia,who could never have imagined that his greatest gift to the russian people would have such an amazing history.
这一句中,出现could+现在完成时的结构,其实是表示“虚拟语气”
情态动词后为什么加现在完成时?
一般来说,情态动词后,是加动词原形的,但你说的这种情况也有、、、、
举个例子：
Fredierick William I,the king of prussia,who could never have imagined that his greatest gift to the russian people would have such an amazing history.
这一句中,出现could+现在完成时的结构,其实是表示“虚拟语气”