If you want to learn the present perfect, or the passive voice, then you need to learn the past participle, also known as the third form of the verb. And you especially need to learn the irregular past participles! And the reality is that many students don't know the third forms of irregular verbs well.
What can you do to solve these problems? Well, Episode 115 is a great place to start! it will give you the forms you need for a solid base to learn the present perfect and the passive voice.

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