Hello guys!
This article explains some prepositons.
Take a look at them and understand better the prepositions.
Resolva exercícios e atividades acadêmicas
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Encontre o professor particular perfeito
These are some vides with the prepositions explanations
How to use IN, AT, and ON in English
http://www.engvid.com/prepositions-how-to-use-in-at-and-on-in-english/
https://www.youtube.com/watch?v=jLX9UqIo_kw
https://www.youtube.com/watch?v=sN5H7YTo_IQ
https://www.youtube.com/watch?v=_zhw3BUysUA
To and for
https://www.youtube.com/watch?v=E3gvjrh5_TY
Over & by
https://www.youtube.com/watch?v=caLxp5UvHlo
