1.過去將來時是指,以過去某個時間為基準(zhǔn),在它的將來發(fā)生的事情.
2.翻譯成漢語,two days later兩天以后,the next day下一天(即第二天）.
eg.
He would come here two days later.(他2天后將來這里）
比較著給舉一個例子：
He says:" I will come here two days later."(他說,我將兩天后來這里）
--------------(一般現(xiàn)在時）
將此句變?yōu)檗D(zhuǎn)述的,即：
He said that he would come here two days later.(他說他將兩天后來里）
-------(that從句為過去將來時）
和過去完成時意義吻合：
He had been here two days later.(兩天后他來這了）
或
He had gone there two days later.(兩天后他去那了）
eg.
He would come here the next day.
和上面例子同理：
He says:" I will come here tomorrow."
He said that he would come here the next day.
（過去時和完成時里的the next day都是由tomorrow來的）
本人英語專業(yè),還有什么不懂的樓主可以再問
建議樓主看看語法書,熟悉確切的語法知識,這樣就不難分析了.
語法生硬,也可以多多閱讀,培養(yǎng)良好的語感,這樣即使不死扣語法,平時遇到句子也會很容易理解的.