In this paper, we study the intonational patterns observed in learners' productions in order to evaluate what motivates the deviations observed: systemic differences between the learners' L1 and the L2, differences in phonetic implementation, etc. The analysis consists of a cross-comparison of the intonation of yes-no questions in French, English and English as an L2. It is based on fve information-seeking yes-no questions that were extracted from the AixOx corpus, which contains a set of 40 texts that were read by 10 native French speakers, 10 Native English speakers and 20 French learners of English. The analysis of the data showed that the differences between native and non-native speakers do not affect the form of the nuclear contour. It mostly shows that French speakers of English have a tendency to assign a rising pitch movement at the end of any prosodic words, which leads to a clear difference in rhythm.