
present perfect progressive
/pɹˈɛzənt pˈɜːfɛkt pɹəɡɹˈɛsɪv/
nouna verb tense used to describe ongoing or continuous actions that started in the past and continue into the present, formed by using the present perfect tense of "to have" (has/have) followed by "been" and the present participle (-ing form) of the main verb

past perfect progressive
/pˈæst pˈɜːfɛkt pɹəɡɹˈɛsɪv/
nouna verb tense used to describe ongoing or continuous actions that started in the past and continued up until another point in the past, formed by using the past perfect tense of "to have" (had) followed by "been" and the present participle (-ing form) of the main verb

zero conditional
/zˈiəɹoʊ kəndˈɪʃənəl/
nouna type of conditional sentence that expresses a factual or general truth, where the condition and the result are both in the present tense and the condition is always true, often formed using the present simple tense in both the condition and result clauses
