were going to 過去將要幹什麼...
因為 WERE 表明 過去了.而 BE GOING 又是進行或將來的意思
所以是過去將來時
比如:they were going to pick apples yesterday
他們昨天正準備摘蘋果的
過去將來時
過去將來時：聽起來很矛盾，但認真想時，因為對過去來說也有將來。例如：She called me when I was going to do some cleaning after dinner yesterday.
昨天晚飯後我要去洗衣服時她給我打電話。