Language comprehension relies on the fundamental ability to create meaningful syntactic structures from single words during on-line processing. Time-resolved neuroimaging techniques can be used to measure electrophysiological activity revealing the neural dynamics underpinning these combinatorial processes in the brain. In the present chapter, we review and critically evaluate studies that have specifically investigated the electrophysiological bases of sentence-level syntactic processing using different types of analyses and paradigms. Besides reviewing event-related potential (ERP) studies, we focus on recent investigations of neural oscillations, highlighting their relevance and implications for our understanding of syntactic processing. Furthermore, we discuss critical issues related to the interpretation of current electrophysiological findings, including open questions such as the relationship between syntax and semantics and the link between ERPs and oscillations.