1.We use the Present Perfect Continuous to show that something
started in the past and has continued up until now. "For five minutes," "for two
weeks," and "since Tuesday" are all durations which can be used with the Present
Perfect Continuous.
EX:They have been talking for the last hour.
2.You can also use the Present Perfect Continuous WITHOUT a duration such as "for two weeks." Without the duration, the tense has a more general meaning of "lately." We often use the words "lately" or "recently" to emphasize this meaning.
EX:Recently, I have been feeling really tired.
الأحد يوليو 21, 2013 3:11 pm من طرف 
موضوع: Present Perfect Continuous 
