The present analysis aims to investigate how Hungarian learners produce neutral tone sequences in Mandarin declarative and yes/no interrogative sentences. In Mandarin, apart from the four full lexical tones, there is a fifth value: ‘neutral tone’, mostly carried by clitic-like particles. It is often assumed to be phonologically unspecified, its realization being highly dependent on the preceding full tone’s coarticulatory effect, as well as on sentence type. The aim of this study is to shed light on how neutral tone, which is extremely plastic in its acoustic realization, behaves when concatenated into sequences of neutral tone syllables, in the production of Hungarian L2 learners, whose L1 is atonal. Interrogative and declarative sentence pairs were produced by two L2 learner groups (lower and upper intermediate) as well as by a native speaker group. F0-contours of utterance-final sequences of 3 to 4 syllables were compared by GAMMs: the 1st syllable determined the full tone context (four different values) followed by the sequence of neutral tones. Our results show that Mandarin native speakers discriminate interrogative and declarative f0-curves, which L2 learners failed to reproduce. However, they did manage to approximate natives in producing boundary tones irrespective of the value of the preceding tone.