Questions & Answers about W lodówce mam szynkę, sałatę i trochę śmietany.
Because w meaning in normally takes the locative case when it answers the question where?
- dictionary form: lodówka = fridge
- after w: w lodówce = in the fridge
So this is a case change, not a different word.
In Polish, subject pronouns are often omitted when the verb already makes the subject clear.
- mam = I have
- masz = you have
- ma = he/she/it has
Because mam already clearly means I have, Polish usually does not need ja. You could say Ja mam, but that adds emphasis, something like I do have.