In – en
(Pronounced ehn)
To remember that in is pronounced ehn (en) in Spanish, use the following mnemonic:
In the envelope (en) there was a large sum of cash!

Examples of en (in) in a sentence
Mi hermana vive en una casa grande.
(My sister lives in a big house.)
Hay un gato en la caja.
(There is a cat in the box.)
El libro está en la mesa.
(The book is in the table.)