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D-13.01 Start Using Present Perfect (Continuous) Tenses
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D-13.02 Use Present & Past Perfect Verb Forms
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D-13.03 Use Present Perfect (Continuous) Verb Phrasing (with Since, For) to Express Continuation
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D-13.04 Use & Contrast Present & Past Perfect (Continuous) Verb Forms, Patterns & Applications
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D-13.05 Compare & (Re)Acquire Present, Past & Future Perfect (Continuous) Verb Forms, Structures, Uses & Implications
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D-13.06 Use the Present Perfect in Statements, Questions & Answers, Learn Past Participles & Add Present Perfect Continuous Sentences
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D-13.07 Use the Present Perfect with Adverbs in Various Meanings
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D-13.08 Master the Present Perfect (Continuous) for Activity in Past Time Up to the Present, Understand & Use Perfect, Continuous Modals
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D-13.09 Use the Past Perfect (Continuous) Tenses
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D-13.10 Progress with Summary & Review the Perfect Tenses
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D-13.11 Get Reasons & Instructions for Use of Intermediate Verb-Forms
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D-13.12 Get 108 Cards for 36 Verbs, Intermediate Base + Past-Form + Past Participles
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D-13.13 Get Reasons & Instructions for Use of Advanced (Irregular) Verb-Forms
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D-13.14 Get 162 Cards for 54 verbs, Advanced Base + Past-Form + Past Participles
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