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Nhấn mạnh đến kết quả của hành động

• Present Perfect

• Present Perfect Continuous

Talk about how much and how many.

• Present Perfect

• Present Perfect Continuous

Talk about how long.

• Present Perfect

• Present Perfect Continuous

Nhấn mạnh thời gian xảy ra sự việc

• Present Perfect

• Present Perfect Continuous

Yet and already are only use for _____.

• Present Perfect

• Present Perfect Continuous

Helen … (to wash) the dishes for fifteen minutes.

• have washed

• has been washing

Sam … (to drive) a car for five hours now.

• has been driving

• has driven

I … (to look) for information on the subject since last Friday.

• have looked

• have been looking

You … (to work) as a computer programmer for more than fifteen years.

• have been worked

• have been working

Andy and Den … (to discuss) the plans for their winter holidays for two hours now.

• have discussed

• have been discussing