By grammatical functions, idioms can be classified into idioms nominal in nature, idioms adjectival in nature , idioms verbal in nature, idioms adverbial in nature and ________ idioms.
By grammatical functions, idioms can be classified into idioms nominal in nature, idioms adjectival in nature , idioms verbal in nature, idioms adverbial in nature and ________ idioms. 【正确答案】：sentence
