Answer:
Introduction. The present perfect progressive tense, also present perfect continuous, expresses an action that begins in the past and lasts until a present or almost present moment.
When to use the present perfect progressive. The present perfect progressive is similar to the present perfect, but we use it to express a continuing or unfinished action, or emphasise ...
Conjugation of English Present Perfect Progressive Tense. To conjugate the present perfect progressive we follow the rule: have/has + been + verb in the -ing form.
Contractions. Contractions are a combination of certain pronouns, verbs and the word not. They are mostly used in spoken and informal written English.
Step-by-step explanation: