Common negation words in Chinese include '不' and '没'. '不' is used for general negation, indicating present and habitual. '没' is mainly used to negate past actions or results, and is often used with '有' to express '没有'.

'Not' is usually used in present, future, and habitual actions. It is placed before verbs, adjectives, or phrases, directly indicating negation.

'Mei' is commonly used to negate actions that have already happened or been completed, and is often contrasted with '了'. 'Mei' can also express that a result did not occur.

'没有' can function as a predicate to express 'not have' or 'not exist'. In spoken language, '没' can sometimes simplify to replace '没有'.

Judgment sentences are negated with '不是', with the structure 'subject + 不是 + noun/phrase'. '不是' is used to indicate that something is not true or not of a certain type.

When indicating that something or someone does not exist in a place, the common pattern is '(place) + 没有 + noun'. This structure expresses that something does not exist at that place.

'Not' or '没' can negate a verb phrase, usually placed before the verb. The choice between '没' and '不' depends on whether it refers to past actions and their results.

'Not' is used to negate adjectives, expressing that a property or state does not hold. The common structure is 'subject + not + adjective'.

'Not necessarily', 'not too', 'not really' are common negation adverb phrases used to express a softened negation or not entirely affirmative. They are softer than simply saying 'not'.

Negative questions use '不' or '没' to ask questions, often expressing speculation, confirmation, or mild opposition. The structure is usually 'subject + 不/没 + verb (+ 吗)'.

Multiple negations may appear in the same sentence, but each negation word still follows its own rule. A common contrast is 'Not... nor...' to indicate both items are negated.