This study investigates how the neutral tone, when preceded by different full tones under different focus conditions, behaves in question intonation in Mandarin. Results indicate that 1) the preceding full/neutral tone largely determines the local F0 trajectory of the neutral tone, but the latter also gradually converges over the course of several neutral tone syllables, 2) post-focus lowering, which is caused by the effect of focus, occurs in both neutral-tone-ending and High-tone-ending sentences, with the interrogative intonation in questions realized as an upward shift starting from the focused word, and 3) sentence-final neutral tone has a falling contour even in questions, thus contrasting with sentence-final High tone, which has a rising contour in questions.