The passive voice (PV) is commonly used when airline products or services are the focus of conversations instead of the carriers providing them. It is formed with a combination of “a verb to be (v2b) and a past participle (pp)”. Using which form of verb to be (is/am/are/was/were/been) depends on the tense of the sentence. A past participle is sometimes called an “-ed” form of verb since it usually has an –ed ending. Irregular verbs may change completely form their base form when we form their past participles such as buy > bought, drink > drunk and fly > flown. However, the past participles of some irregular verbs look exactly the same as their base form such as quit > quit, upset > upset and split > split