9. 2 Classification of idioms
According to grammatical function, idioms can bedivided into 5 types:
1) Idioms nominal in nature名词性习语
They function as nouns in a sentence:
White elephant; brain trust; Jack of all trades
2) Idioms adjectival in nature形容词性习语
They function as adjectives in a sentence.E.g.:
cut and dried; wide of the mark; up in the air
3) Idioms verbal in nature 动词性习语
They function as verbs in a sentence.E.g.:
put down to; turn on; get awaywith
4) Idioms adverbial in nature 副词性习语
They function as adverbials in a sentence. E.g.:
tooth and nail 竭尽全力; in nothing flat 不久; through thick and thin 不顾艰难险阻
5) Sentence idioms 句子式习语
Such idioms are usually in complete sententialform. They are usually proverbs or sayings.E.g.:
Never do things by halves.
All is not gold that glitters.

