Question

The sentence has four underlined words or phrases. Choose the word or phrase that must be changed for the sentence to be correct:

River water pollution is often indicate by algae distribution.

• A. pollution
• B. indicate
• C. by
• D. algae distribution

Answer 1

The correct option is B indicate

Let’s examine the sentence: “River water pollution is often indicate by algae distribution.” The noun phrase, i.e., ‘river water pollution,’ is succeeded by verbs, ‘is’ and ‘indicate’ followed by preposition ‘by’ and then again noun phrase, ‘algae distribution.’ The first noun phrase is acting as subject of the sentence and the last noun phrase, as the object of the sentence. The present helping verb ‘is’ before the action verb ‘indicate’ shows that the action is being done by the object on the subject.
Active voice describes a sentence where the subject performs the action stated by the verb. In passive voice sentences, the subject is acted upon by the verb.
Hence, the sentence is in passive voice, and not active voice, as the passive forms are made up of the verb be with a past participle. So, the ‘be’ form is given with ‘is’ and the past participle would be given by ‘indicate.’ Therefore, the past participle of ‘indicate’ which is ‘indicated’ would be used here. Hence, the word or phrase that must be changed for the sentence to be correct is indicated by Option B. Option B is the correct answer.