You could say: 1. "Farsi baa man harf nazan" which literally means "Don't speak in Persian with me" 2. "Azizam, man farsi mifahmam!" which means "Honey, I can understand Farsi!"

just kiss her and say "che ba namak sohbat mikoni, farsi kheili shirineh" :)

I just add that some Persian girls are sensitive:) and if you tell her ''Baa man Farsi harf nazan\sohbat nakon'' با من فارسی حرف نزن\صحبت نکن'' maybe she'll get annoyed...(which as Adib mentioned, literally means "Don't speak in Persian with me") I offer you these words: ''Azizam, man Farsi mifahmam! (but by telling this she'll find that it isn't true and after some questions it will be obvious for her and maybe you use it just for surprising and fun)...So, it is better to say: ''Azizam, dark mikonam ke alan narahati, vali mishe beporsam chera va chikar mitunam bokonam ke dige toro narahat nabinam? shayad ba englisi sohbat kardan behtar betunim be natije beresim ke chikar konam ke dige azizam ro narahat nabinam'' عزیزم، درک می کنم که الان ناراحتی، ولی میشه بپرسم چرا و چیکار می تونم بکنم که دیگه تو رو ناراحت نبینم؟ شاید با انگلیسی صحبت کردن بهتر بتونیم به نتیجه برسیم که چیکار کنم که دیگه عزیزم رو ناراحت نبینم... ''My dear (honey), I understand you that you are upset now, but can I ask you why and what I can do for not seeing you upset again? maybe with speaking in English, we can conclude better that what I should do for not seeing my honey upset anymore'' If you want to try shorter sentences: - Vay ke cheghadr lahjeye farsit doost dashtanie وای که چقدر لهجه ی فارسیت دوست داشتنیه Wow! your Farsi accent is very lovely... - Vaghti Farsi harf mizani doost daram faghat negat konam وقتی فارسی حرف می زنی دوست دارم فقط نگات کنم When you are talking Farsi, I just love to see your face... - Cheghadr lahjeye Farsit be delam mishine چقدر لهجه ی فارسیت به دلم می شینه How much your Farsi accent is pleasant for my heart... etc In these three sentences seems that you like her Persian accent! but maybe will make other influence on her for stopping speaking Persian since she'll wonder but I'm not sure :) PS: Azizam is common phrase in Iran but be aware that if you have closer relationship with her (such as girlfriend) use this phrase for calling her...