The grandmother is in one.
As written, "My grandmother a house in the suburbs." You seem to have left out a verb. "My grandmother has a house in the suburbs" would be "Mi abuela tiene una casa en los suburbios."
"Vivo en una casa" in English means "I live in a house."
Le film est sorti en ... means 'the movie was first shown in ..."
? Literally 'in a/one (female)'
"En mi cuarto hay una cama" significa "There's a bed in my room."
I am in love with you
The French phrase 'est en amour' is quite common in the English language. It is what we say when someone we know 'is in love'.
A party in July.
"On est en bas" in French means "we are downstairs" or "we are at the bottom." It can refer to a physical location, a position relative to others, or a situation where someone is feeling down or at a low point.
Yo vivo en una casaVivo en una casa. Vivo en una casa.
It means "I live on a farm in the country".
Is there a computer in your class?