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Watch Later 8:49

Simple Past Tense 3: Irregular Verbs

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Simple Past Tense 2: Regular Verbs

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Simple Past Tense 1: When we use it

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4S M1 - 5.2A - 相對極大/極小值,駐點(平穩點), 轉向點, 拐點

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4S M1 - 5.2A - Relative max min, stationary, turning, inflexion pts

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4S M1 - 5.1 - 曲線的切線

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4S M1 - 5.1 - tangents to a curve

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