i had no idea when and where it happened可以用it had

问题描述:

i had no idea when and where it happened可以用it had
i had no idea when and where it
happened可以用it had happened么

最好用happened,因为一般过去时单纯强调动作发生的时间和地点,而完成时强调动作造成的影响了解再问你个 刚看语法 说become表渐变可用进行时''后来又看到不用进行时的系动词又有become'到底什么意思?可以用进行时。例如 Our country is becoming stronger and stronger. 有些语法书也不一定全对