present perfect.
A past tense verb that indicates an action that happened in the past prior to another action is "had done." This verb form is used to show that the action was completed before another action occurred.
The verb "had stopped" is in the past perfect tense. It indicates an action that was completed before another past action or time in the past.
"Had been sent" indicates a past action that occurred before another past event, while "has been sent" indicates a completed action that happened recently or is still ongoing in the present.
"Sent" is the past participle form of the verb "send" and is correct in constructions such as "had sent" which indicates an action that was completed before another past action.
Will have completed is in the future perfect tense, which indicates an action that will be completed before a specific time in the future.
The helping verb "have" is used to form the past perfect tense because it indicates that the action was completed before another past action or point in time. This tense is used to show that an action happened earlier in the past relative to another action.
The verb phrase "will have completed" is in the future perfect tense. It indicates an action that will be completed in the future before a specified time.
"Had warned" is in the past perfect tense. It is used to show that an action was completed before another action in the past.
The verb tense in the sentence is future perfect tense. It indicates an action that will be completed at some point in the future before another specified time.
"Will have broken" is in the future perfect tense, indicating an action that will be completed at a point in the future before another future action or time.
Had believed is in the past perfect tense. It is used to indicate an action that was completed before another action in the past.