Identify the correct Passive form of the following sentence from the options given below:

They have decided to increase the salary this year.

It has been decided to increase the salary this year

The correct answer is Option (1) → It has been decided to increase the salary this year

To form the passive voice, we need to make the following changes:

• The subject of the active voice sentence becomes the object of the passive voice sentence.
• The object of the active voice sentence becomes the subject of the passive voice sentence.
• The main verb of the active voice sentence is changed to the past participle form.
• We add the auxiliary verb be to the beginning of the sentence.

In this case, the subject of the active voice sentence is 'They' and the object of the active voice sentence is the salary. The main verb of the active voice sentence is increase.

To make the sentence passive, we change the subject to the salary and the object to It. We change the main verb to the past participle form, which is increased. We add the auxiliary verb be to the beginning of the sentence.

It has been decided to increase the salary this year

The other options are not correct because they do not follow the rules for forming the passive voice. For example, option 2, "This year salary has been decided to increase," is not correct because the subject is not in the passive voice. Option 3, "Salary has been decided to increase that year," is not correct because the object is not in the passive voice. Option 4, "That year salary had been decided to be increased," is not correct because it is too complex and it is not in the correct grammatical form.