Subject Verb Agreement in Active and Passive Voice
The passive forms of a verb are created by combining a form of the "to be verb" with the past participle of the main verb. Other helping verbs are also sometimes present: The passive can be used, also, in various tenses.  Let's take a look at the passive forms of "design.   Tense Subject Auxiliary Past  Participle Singular Plural Present The car/cars is are designed. Present perfect The car/cars has been have been designed. Past The car/cars was were designed. Past perfect The car/cars had been had been designed. Future The car/cars will be will be designed. Future perfect The car/cars will have been will have been designed. Present progressive The car/cars is being are being designed. Past progressive The car/cars was being were being designed.   Note the use of subject verb agreement in the passive.

#### Summary

The passive forms of a verb are created by combining a form of the "to be verb" with the past participle of the main verb. Other helping verbs are also sometimes present: The passive can be used, also, in various tenses.  Let's take a look at the passive forms of "design.   Tense Subject Auxiliary Past  Participle Singular Plural Present The car/cars is are designed. Present perfect The car/cars has been have been designed. Past The car/cars was were designed. Past perfect The car/cars had been had been designed. Future The car/cars will be will be designed. Future perfect The car/cars will have been will have been designed. Present progressive The car/cars is being are being designed. Past progressive The car/cars was being were being designed.   Note the use of subject verb agreement in the passive.
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