Breakdown of Meto a chave na porta.
a chave
the key
na
in the / on the / at the (f.sg)
a porta
the door
meter
to put (into)
Questions & Answers about Meto a chave na porta.
Why use meto instead of ponho or coloco for "I put"?
Where is the word "I" in this sentence?
Why is it na porta (in the door) instead of just em porta?
In Portuguese, you almost always need to include the word for "the" when talking about specific objects. Here, the preposition em (in/on) merges with the feminine word for "the", which is a. Together, em + a combine to make the single word na.
Does porta mean "lock" or "door"?