现在完成进行时

　　1. 现在完成进行时的定义

　　现在完成进行时表示某动作从过去某个时间开始，一直延续到现在，并且还有可能持续下去。如：

　　Those cats have been screaming for hours. 那些猫叫了半天了。

　　We have been waiting for him for two hours. 我们等他等了两个小时。

　　The dollar has been climbing steadily all week. 整个星期美元一直在稳步增值。

　　2. 现在完成进行时的结构

　　现在完成进行时由“have / has been +现在分词”构成。如：

　　Sales have been dropping off badly.

　　销售量一直减少得很厉害。

　　I have been waiting for an hour and a half.

　　我一直等了一个半小时了。

　　We’ll have been living here for two years by next Sunday.

　　到下星期日，我们在这里就住了整两年了。

　　3. 现在完成进行时的主要用法

　　⑴表示“持续”：即表示一个从过去某时开始一直持续的动作，这动作可能刚刚停止，也可能还在进行。如：

　　She is very tired. She’s been working all morning.

　　她很累。她干了一早晨了。

　　Tom has been seeing about a work permit for you.

　　汤姆一直在想办法给你弄一个工作许可证。

　　The tobacco industry has been trying to improve its image.

　　烟草行业一直在试图改善其形象。

　　⑵表示“重复”

　　即表示在一段持续的时间内动作的多次重复，而这个重复的动作在说话时并不一定在进行。如：

　　We’ve all along been making mistakes like this.

　　我们一直犯这样的错误。

　　Jim has been phoning Jenny every night for the past week.

　　一星期以来吉姆每天晚上给詹妮打电话。

　　【例题】Shakespeare’s play Hamlet_______ into at least ten different films over the past years.

　　A. had been madeB. was madeC. has been madeD. would be made

　　【解析】C.考查动词时态。根据此句标志词over the past years应使用现在完成时态。