were going to 过去将要干什么...
因为 WERE 表明 过去了.而 BE GOING 又是进行或将来的意思
所以是过去将来时
比如:they were going to pick apples yesterday
他们昨天正准备摘苹果的
过去将来时
过去将来时：听起来很矛盾，但认真想时，因为对过去来说也有将来。例如：She called me when I was going to do some cleaning after dinner yesterday.
昨天晚饭后我要去洗衣服时她给我打电话。