In future, I would make sure Id checked out whoever was fitting it with their previous customers.
请问 make sure 后面的从句中为何用过去（完成）时而不需要目前（完成）时？
▲第一注意：in future不肯定指“从目前往后”。它可以用于过去以后时，意为“从那将来”，“从当时那个时间往后”。比如：
I asked her to be more careful in future. 我要她将来要愈加小心。
He would never make such a mistake in future. 他从那将来决不再犯这样错误。
包含你的例句：
In future, I would make sure Id checked out whoever was fitting it with their previous customers.
▲在would make sure的宾语从句中，had checked out 是“过去的过去”，说明发生在would make sure 之前。而在checked out的宾语从句中，用过去进行时 was fitting，不需要目前进行时，由于从句的时态受主句制约。大家不可以说：He asked me what I am doing. 应改为was doing。
