Learn Farsi: قراره که من تو خونه بمونم.

Gharâr ast (or its spoken form gharâre) is an impersonal expression. It literally means "it is planned" or "it is established." Instead of conjugating the first part, Farsi uses the impersonal phrase and puts the real subject ("I") in the second clause: literally, "It is planned that I stay home."

Why is the verb bemunam in the subjunctive form here?

Expressions of expectation or planning, like gharâr ast ke, trigger the present subjunctive for the action being planned. Because "staying" is a planned event rather than a current fact, we use the subjunctive prefix be- on the verb, giving us bemunam instead of the indicative mimunam.

Is gharâre just the spoken version of gharâr ast?

Exactly. In spoken Farsi, the verb ast (is) frequently attaches to the end of the preceding word as an -e sound. So, gharâr ast merges into gharâre.

Why does the sentence use tu khune instead of the formal dar khâneh?

This sentence reflects natural, everyday spoken Farsi. Tu is the conversational word for dar (in/at), and khune is the colloquial pronunciation of khâneh (house/home).