What is the structure of the present perfect continuous tense?
Anglès tècnic - Instal·lacions elèctriques automàtiques
a:
AUXILIARY 'HAVE' + PAST PARTICIPLE
b:
AUXILIARY 'TO BE' + VERB ENDING IN -ING
c:
AUXILIARY 'HAVE' + VERB ENDING IN -ING
d:
AUXILIARY 'TO BE' + PAST PARTICIPLE
Resposta correcta: b
Explicació: The present perfect continuous tense emphasizes the continuity of an action that started in the past but is still ongoing, and is formed with the auxiliary 'to be' and the verb ending in -ing.
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