Learn Portuguese (Portugal): Os meus sapatos estão debaixo da cama.

The phrase for 'under' is debaixo de. However, we need to say 'under the bed'. Since bed (cama) is a feminine word, 'the bed' is a cama. In Portuguese, the preposition de and the article a always merge together to form da.

Why do we need Os at the beginning? Doesn't that translate to 'The my shoes'?

Yes, it literally translates to 'The my shoes'! In European Portuguese, you almost always put a definite article (like O, A, Os, or As) before possessive words like 'my' (meu). Because sapatos is masculine and plural, we use Os meus.

Why does this sentence use estão for 'are' instead of são?

estão comes from the verb estar, which is used to talk about the physical location of people or movable objects. Because you are talking about where your shoes are placed right now, you use estar instead of the other 'to be' verb, ser.

How do you pronounce the letter 'x' in debaixo?

In the word debaixo, the letter 'x' makes a 'sh' sound, just like in the English word 'shoe'. The whole word sounds roughly like 'd-BYE-shoo'.