Sentence-final particles occur at the end of sentences in Chinese. These particles carry various features (e.g. semantic, syntactic and discourse features) to behave functionally in sentences. In this presentation, features attached to eight sentence-final particles will be analysed from a cross-linguistic perspective to exemplify their differences and similarities in Chinese and English. An empirical study including both on-line and off-line methods was conducted to investigate theoretical hypotheses from the linguistic comparisons. Results from the study concerning these particles will be shown in the current presentation as well. The findings will be discussed and concluded from both a linguistic and second/heritage language acquisition perspective.