Present Perfect vs Simple Past (teoría + problemas).

• (conversation)
• (present perfect tense vs past simple tense)
• (present perfect tense: regular and irregular verbs)
• (irregular verbs)
• (grammar structure: present perfect and simple past)
• (key words)
• (exercises 1)
• (let's practice)
• (get ready)
• (phrasal verbs)
• (exercises 2)
• (vocabulary: wild animals)

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• (difference)
• (regular and irregular verbs)
• (irregular verbs)
• (present perfect tense vs past simple tense)(examples)
• (present perfect)
• (key words)
• (exercises 1)
• (execises 2)
• (phrasal verbs)(exercises 3)
• (vocabulary: wild animals)