As the given sentence in the direct speech is in the simple present tense, we will change it to simple past tense in the indirect speech. Oprion A – ‘The teacher told the students that they will study hard for the test on comprehension.’ is incorrect as the sentence is in the simple future tense. Thus option A is incorrect.Option C –
‘The teacher told the students that they could study hard for the test on comprehension.’ is incorrect as ‘could’ is the past tense of ‘can’. Also, ‘could’ is used for possibilities or while explaining a hypothetical situation. Thus option C is incorrect. Option D –
The teacher told the students that they are going to study hard for the test on comprehension.’ is incorrect as ‘is going’ is used to form the sentence in the present continuous tense. Thus option D is incorrect. Option B –
The teacher told the students that they had to study hard for the test on comprehension.’ can be used here as we often use ‘had’ with an infinitive verb instead of ‘must’ in the indirect speech. Thus option B is the correct answer. ‘The teacher told the students that they had to study hard for the test on comprehension.’
