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《Learning about Language》PPT课件优质课下载
They have cleaned the classroom.
He has already finished his homework.
I have visited my hometown recently，whose changes have left a deep impression on me.
有什么特征呢？
The Present Perfect Tense
现在完成时:
1. 构成：have/has +过去分词 ，has用于第三人称单数， 其他人称用have 。
2. 用法：表示过去发生的某一动作对现在造成的影响或结果。
Lead-in
e.g. 我从1975年起就学英语。
I have studied English since 1975.
自12世纪以来, 中国就使用彩色印刷了。
They have done color printing in
China since the 12th century.
He has been writing a novel，which will be finished next month.
Recently she has always been helping me.
I have been cleaning the room all the afternoon.
例句观察2
有什么特征呢？
Present Perfect Continuous Tense
现在完成进行时:
构成：have/has＋been＋现在分词（doing）
2. 用法：
1) 强调动作的持续性。 表示动作从过去某时开始，一直延续到现在，还可能延续下去。如：
①I have been waiting for an hour，but she hasn't come yet.