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perfect-continuous × 36present-perfect × 18
tense × 10
perfect-constructions × 5
present-perfect-progressive × 3
grammar × 2
grammaticality × 2
american-english × 2
present-tense × 2
continuous × 2
aspect × 2
sentence-construction × 1
phrase-meaning × 1
sentence-meaning × 1
difference × 1
verbs × 1
modal-verbs × 1
questions × 1
passive-voice × 1
past-perfect × 1
past-simple × 1
present-continuous × 1
exam-questions × 1
adverbial-phrases × 1
progressive-aspect × 1