全77節19大專題【從理解到掌握三步法搞定】English Grammar 外教語法精講課 海量句例加深記憶 P10 - English Grammar-Set 4-01 Used to (Learn)

This lecture explains the English grammatical structure \"used to,\" covering its specific pronunciation, its two primary meanings regarding past habits and states, and the grammatical formulas for positive, negative, and interrogative sentences.