The clauses above bear examples of a common verb tense: the present perfect continuous. This is the tense that indicates an action ...

We can use the present perfect continuous to: 1. talk about an activity which started in the past and is still going on now: He has been working here for three years. He started working in ...

present perfect continuous: has ('s) / have ('ve) + been + ing present perfect simple: has ('s) / have ('ve) + past participle If the contracted forms present the greatest difficulty, it will be ...