How to correctly use preposition -EM in European Portuguese. Grammar lesson for beginners

Hi, I'm karolinti andthis is European Portuguese lesson.
In this episode I would like to present to you preposition -EM. Its meanings and use. If you feel unconfortable everytime you see or hear em, no or nas - this lesson is for you!
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TIMESTAMPS:
00:00 - intro
01:00 - meanings of preposition em
02:02 - preposition em joined with articles
03:56 - preposition em joined with demonstratives
06:08 - verbs with preposition em
06:31 - asking for subscription ;)

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