Evidence-based answer · Last updated · How it’s made
Because you grew up around Persian, you're likely what researchers call a "heritage speaker" — someone who absorbed Persian at home but whose schooling and daily life happened mostly in English. The research suggests your path should look different from a total beginner's: you likely already have strong listening comprehension and conversational instincts, but probably weaker vocabulary breadth, grammar precision (especially in less-common structures), and — most reliably — literacy, since reading and writing in Persian are rarely taught at home. The most evidence-backed strategy is to get targeted instruction that builds on what you already have rather than starting from zero.
Asked as someone learning Persian (beta). Findings drawn from Persian-specific research are framed for Persian learners and may not hold for other languages; where the evidence is general second-language research, the report says so.
Persian-language pedagogy research explicitly treats people who grew up with Persian-speaking parents (heritage speakers) as a separate category from both native speakers raised entirely in Iran and complete beginners with no family connection to the language. University Persian programs in the US even track how heritage learners' strategies and motivations differ from other learners.1,7
In plain terms
Studies of Persian-English bilingual children and teens in New Zealand found that heritage speakers scored lower than monolingual Persian speakers in Iran on both vocabulary tests and on how varied and sophisticated their word choices were in storytelling, even though many still speak fluently and conversationally.2,3,4,6
Among Persian heritage speakers, those who moved to an English-speaking country later in childhood (or grew up hearing Persian first before English) generally retained richer vocabulary than those exposed to both languages from birth or who emigrated very young. Current age also predicted skill for those born abroad.2,4,6
Interviews with Iranian immigrant parents in New Zealand and the UK found that most were satisfied if their children could just hold a conversation in Persian; reading and writing were rarely prioritized, largely because there weren't accessible community Persian schools. As a result, heritage speakers commonly have much stronger speaking/listening skills than reading/writing skills.2,3,5
For people who learned Persian and English at the same time from birth, how positively and consistently their parents pushed Persian use was the single strongest predictor of their eventual vocabulary. For those who learned Persian first and picked up English later (after starting outside Iran), age at the time of that switch mattered more than parental attitude.2,4
Research on heritage speakers of other languages (mainly Spanish, but treated as broadly informative for heritage bilinguals generally) shows a consistent pattern: core grammar rules tend to stay solid even in speakers with reduced exposure, while grammar tied to subtle meaning or context — things like when to use one verb form versus another to signal social nuance — is the part most likely to feel shaky or inconsistent.8,9,11,16
In plain terms
Example
Some researchers push back on calling heritage speakers' Persian or other heritage languages 'incomplete' or deficient. They argue heritage grammars are natively acquired and fully functional systems that simply differ from a monolingual standard, often because of how much instruction and reading exposure a person got in that language growing up, not because something is 'broken'.10,12
In a study of heritage speakers of Spanish (used here as the closest evidence available, since no equivalent Persian study was provided), a short course of explicit grammar teaching plus feedback led to significant improvement on a specific tricky grammar point, at least in the short term. This suggests structured lessons — not just more casual exposure — can sharpen precisely the areas heritage speakers tend to lack.13
Example
An 18-week reading and writing program for child heritage speakers of Spanish (again the closest available evidence) produced significant improvements in vocabulary, reading fluency, and reading accuracy compared to children who didn't take part — showing that literacy, the area heritage speakers are weakest in, responds well to targeted teaching.15
Programs teaching Persian as a second/heritage language in the US (Berkeley, UCLA, UT Austin, and others reviewed in a major handbook on Persian pedagogy) have developed specific coursework, materials, and even blended/technology-based approaches partly shaped by the presence of many heritage learners alongside non-heritage learners in the same classrooms.1,7
A study asking Iranian-American bilinguals to guess whether a sentence was written by a native speaker, a heritage speaker, or a learner found that certain grammar slips (like errors in marking direct objects or negative sentence structure) and use of English loanwords made listeners judge a speaker as less likely to be native — heritage speakers themselves weren't penalized as harshly as pure learners were for the same errors, but their speech is still being actively evaluated by the community.14
Now pick something to do it with
Each of these opens an overview of the apps, courses and immersion material worth a look for that — filtered to exactly what the advice above points you at:
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