hadbeen doing是什么时态

　　特别含义：

　　1、尚未完成：

　　He had been writing the novel．（他没有完成它）

　　2、企图：

　　He had been studying the meaning of this proverb．（他一直在努力学习它）

　　3、未得结果：

　　We had been studying what our enemy had said．（但我们不能理解）

　　4、最近情况：

　　He had been quarrelling with his wife．（近来）

　　5、情绪：

　　What had he been doing？（不耐烦）