| 1 | Function words include six kinds: adverbs, prepositions, conjunctions, particles, interjections , and onomatopes. | |
| 2 | In the non-subject-predicate sentences, the interjection, noun and adjective non-subject-predicate sentences express exclamation mood more frequently. | |
| 3 | Ghosts were saying "boo!" by the middle of the 19th century, though the exclamation had been used to frighten English-speaking children for at least 100 years before that. | |
| 4 | The paper compares and analyzes the interjections and onomatopoeic words in three "Modern Chinese Language" textbooks and concludes that these two classes of words both belong to content words. | |
| 5 | And noun is the most frequently switched in single word, but no single switching of preposition, particle, interjection, Quantifiers and Onomatopoeia. |