السلام عليكم ورحمة الله وبركاته If I know a little bit of arabic and darija (Moroccan dialect), can I make dua in arabic and the words that I don't know in Arabic I say them in darija, and words that I don't know in darija or Arabic, I say in English. Whether outside or inside the prayer

If you know the Arabic, even if it is in a certain dialect, then you can ask Allah Subhanahu wa Ta'ala using what you know. As for making a combination of Arabic and English, I do not recall any fatwas regarding this. However, when you make duas that you know in Arabic, then make those duas in Arabic. If you then want to ask Allah Subhanahu wa Ta'ala for something specific—for example, for pious children—and you do not know how to say this in Arabic, you can say it in English.