In such cases, the verb is in its participle form.

So in this last example the participle form does match up and produces a grammatically well-formed sentence.

Use has/have + the past participle form of the verb.

Use had + the past participle form of the verb.

Some of the verbs also have a suffix in the past participle form.

Other nouns are derived from verbs by transforming them to their participle form.

This specialized usage returns jonesing to its original state of a proper noun in participle form.

Spoken is the past participle form of "to speak".

There are some irregularities when creating the past participle form.

This supplies the past and past participle form had to, and other forms (to) have to, having to.