【推荐1】观察句子完成填空
1.He has been watching television all day.
2.I am tired. I have been painting the living room all the morning.
3.We have been discussing the matter several times this year.
4.His eyes ache. He has been sitting in front of the computer all the afternoon.
5.They have been building the bridge for two months.
6.He has not been working since he was fired three months ago.
1. 现在完成进行时态的构成：肯定形式：_________________ 。否定形式：_________________。
2. 现在完成进行时表示动作开始于过去，并__________到现在，动作可能__________，也可能__________。

【推荐1】观察句子完成填空
1.He has been watching television all day.
2.I am tired. I have been painting the living room all the morning.
3.We have been discussing the matter several times this year.
4.His eyes ache. He has been sitting in front of the computer all the afternoon.
5.They have been building the bridge for two months.
6.He has not been working since he was fired three months ago.
1. 现在完成进行时态的构成：肯定形式：_________________ 。否定形式：_________________。
2. 现在完成进行时表示动作开始于过去，并__________到现在，动作可能__________，也可能__________。