PRESENT PERFECT CONTINUOUS: Present Simple of To Have + Past Participle of To Be + Base form of the Main Verb with the -ing ending.
Example Sentences
How and When It's Used: 1 and 2
Present Perfect Simple Vs. Present Perfect Continuous
Perception and Stative Verbs or with negative sentences
How and When It's Used: 3 and 4
With negative sentences to show irritation
Summing up

To enhance your skills, check out the previous posts

© L. R. Capuana

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