Adverb
With circumlocution.
Source: Webster's dictionaryBroderick 1993, 276 However, as noted above, most finite verbs are formed periphrastically, using an auxiliary verb in conjunction with the verbal noun. Source: Internet
These verbs have only three principal parts, since the perfect of ordinary passives is formed periphrastically with the perfect participle, which is formed on the same stem as the supine. Source: Internet