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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