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The Preposition "Em"

In

The preposition emin, on, at, about is usually a bit easier to understand compared to others. Although there are multiple uses, em most commonly refers to being “in” something, either physically or conceptually:

Estamos em SetembroWe are in September
Ela está em LisboaShe is in Lisbon
Ela divide o quarto em doisShe divides the room in two
Estar em dúvidaTo be in doubt
Ele está em boa condição física.He is in good physical condition.
Ela está em choqueShe is in shock

Other Meanings

Em can also have other meanings, such as about, on, and at.
Penso em tiI think about you
Ela aposta em mimShe bets on me
Eles ficam em casaThey stay at home

Contractions

Let’s look at the contractions formed when em is combined with the definite articles o, a, os, or as:

othe athe osthe asthe
emin no na nos nas

Eles vivem no JapãoThey live in Japan
Estou na garagemI am in the garage
O jantar está na mesaDinner is on the table
Tu pensas nas tuas amigasYou think about your friends
Os livros estão nas caixasThe books are in the boxes
Em also forms contractions when combined with the third-person personal pronouns ele, ela, eles and elas, as such:

elehe, him elashe, her elesthey, them (masc.) elasthey, them (fem.)
emin nele nela neles nelas

These contractions may define a position in relation to an object or subject, and as you’d expect, they also agree in gender and quantity with the noun they describe.
The word em can also be combined with demonstratives, as well as some other words, such as in the examples below:
Eu não confio neleI don't trust (in) him
O segredo está nelaThe secret is within her