How strong is the relationship between English oral language proficiency and English reading comprehension, and does it vary by learner population?

Why oral language and reading comprehension go together

Reading comprehension is not just about decoding words on a page. It draws on the same underlying language system used in listening and speaking: knowing what words mean, understanding how sentences are put together, and following the logic of a passage. When a learner struggles with oral vocabulary or listening comprehension, reading comprehension tends to struggle too. In one study of English language learners, students identified as poor comprehenders scored significantly lower than average and good comprehenders on vocabulary breadth, listening comprehension, and morphological awareness—the ability to recognize meaningful word parts [5].

That pattern held even when comparing English language learners with peers who spoke English as a first language. Poor comprehenders from the English-learner group scored lower than poor comprehenders from the English-first-language group on vocabulary breadth, listening comprehension, and morphological awareness, though the two groups did not differ on higher-level skills like inference and comprehension monitoring [5]. In other words, oral language gaps were a distinguishing feature of reading difficulty for the English learners specifically.

The link is stronger for some bilingual learners than for English-only peers

The relationship is not uniform across learner populations. In a study of adolescents that included English-only students, proficient bilinguals, and emergent bilinguals, oral language skills correlated with reading for both bilinguals and English-only students, but the relationships were more robust for the bilinguals [1]. That suggests oral proficiency may play a larger role in reading comprehension for students who are managing two languages, even when their English skills are strong.

The type of oral skill also mattered. Speech production—how well students could produce spoken English—was significantly related to reading only for emergent bilinguals, not for proficient bilinguals [1]. Proficient bilinguals performed comparably to their English-only peers on all language and reading measures, which suggests that being bilingual by itself does not depress English language proficiency [1]. The heightened oral-reading link for bilinguals therefore is not simply a sign of weaker English; it appears alongside comparable overall performance.

What this means for teaching and assessment

For emergent bilinguals, oral language support may be especially important for reading comprehension, since both general oral skills and speech production were tied to reading in that group [1]. For English language learners who struggle with reading, assessing vocabulary breadth and listening comprehension could help identify where the breakdown is happening, because poor comprehenders in this population showed weaknesses in exactly those areas [5].

The evidence does not support a one-size-fits-all approach. The same oral skill can matter differently depending on a learner's English proficiency and bilingual status: speech production was linked to reading for emergent bilinguals but not proficient ones [1], and oral language generally was more strongly tied to reading for bilinguals than for English-only students [1]. That means the strength of the oral-reading relationship should be interpreted in light of who the learner is, not treated as a fixed number.

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