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The auxiliary verb "have" creates the perfect tenses and is used with the past participle of a verb. The word not is an adverb used to express the negative. It is used between the auxiliary verb and the verb.

Example:

Verb take, past tense took, past participle taken -

Past Perfect : "He had taken the money from the safe."

Past Perfect : "He had not taken the money from the safe."

The continuous tenses use the present participle(-ing) form -

Past perfect continuous : "He had been taking his medicine."

Past perfect continuous : "He had not been taking his medicine."

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11y ago

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