... of economic cycles been helpful in predicting turning points in cycles, they would have been used more consistently.
Psychological theories
Psychological theories have
Had psychological theories
Psychologists have theories
Pembahasan: Conditional Sentence (Inversi Tipe 3)
Bentuk tanpa if untuk kondisi lampau: had + S + V3, lalu diikuti klausa utama irrealis.
Bandingkan pilihanmu dengan sobat pembelajar yang lain.