Grammatical particles, or simply particles, are words that convey certain grammatical meanings. The term is often applied to words that are difficult to classify according to traditional grammar.[1] Both Classical Chinese and Modern Standard Chinese make use of particles. In Chinese, particles are known as zhùcí (simplified Chinese: 助词; traditional Chinese: 助詞) or yǔzhùcí (语助词; 語助詞).[1] They belong to function words (虚词; 虛詞; xūcí). In other words, they have no lexical meaning, but are used to indicate certain grammatical information. This contrasts with content words (实词; 實詞; shící).[2] Particles in Chinese usually take the neutral tone.[3]: p. 238