Many studies show that it is challenging to encode morphosyntactic information while writing. Spelling plurals is especially demanding in French as these are inaudible. Even by the end of primary school, monolingual French pupils still have difficulties marking plurals of some grammatical categories. We investigate (1) how multilingual pupils learning French as a second written language deal with silent plural markers and (2) the effects of a morphosyntactic training explicitly focussing on grammatical categories and their markers, as well as visualizing the plural agreement. 228 fifth graders were quasi-randomly assigned to an intervention (n = 137) and a control group (n = 91) based on the results of a spelling pre-test. The results of the pre-test show that multilingual learners have similar spelling patterns as French monolinguals. They pluralize nouns more accurately than verbs and perform lowest on adjectives. After the pre-test, both groups were trained over six sessions of 20 minutes. The control group participated in French listening comprehension activities. The post-test shows that the intervention group significantly improved in spelling plurals compared to the control group. A greater focus on morphosyntactic structures is highly effective especially in second language contexts where children might lack broad lexical knowledge.

Although French plural spelling has been studied extensively, the complexity of factors affecting the learning of French plural spelling are not yet fully explained, namely on the level of adjectival and verbal plural. This study investigates spelling profiles of French plural markers of 228 multilingual grade 5 pupils with French taught as a foreign language. Three analyses on the learner performances of plural spelling in nouns, verbs and pre- and postnominal attributive adjectives were conducted (1) to detect the pupils’ spelling profiles of plural marking on the basis of the performances in the pretest, (2) to test the profiles against two psycholinguistic theories, and (3) to evaluate the impact of the training on each spelling profile in the posttest. The first analysis confirms the existing literature that pupils’ learning of French plural is not random but ordered and emphasizes the role of the position for adjectives (pre- or postnominal) on correct plural spelling. The second analysis reveals the theoretical difficulties of predicting spelling of adjectival and verbal plural. The third analysis shows that strong and poor spellers both benefit from a morphosyntactic training and provides transparency and traceability of the learning trajectories. Together, the descriptive analyses reveal clear patterns of intra-individual spelling profiles. They point to a need for further research in those areas that have empirically provided the most inconsistent results to date and that are not supported by the theories: verbs and adjectives.

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