Explanation
The two ways of relating what a person has said are 1)direct and 2)indirect (reported).
In the direct speech, the exact words of the original speaker are repeated.
In the indirect speech (reported speech), the exact meaning of what the speaker told is expressed but not necessarily in the speaker’s exact words.
Option A is correct as the conjunction if is used and 'can' is transformed to 'could'.
Options B, C, and D are wrong as 'can' cannot be used, 'if' is not used, and 'could' is not used respectively.
The correct answer is A) He asked me if I could solve that problem.
In direct speech, the exact words of the original speaker are repeated.
As per the rule, when any sentence is rewritten in indirect speech, can is converted to could. And the first person changes to the third person as per the subject. 'I' changes to 'he' and 'you' changes to 'him'. Therefore option C is the correct answer.
As per the rule, when any sentence is rewritten in indirect speech, will is converted to would. And first person changes to third person as per the subject. Therefor option A is the correct answer.
Option D is correct as the third form of 'need' is used.
Options A,B, and C are wrong as 'do you', 'did he', and 'you' cannot be used respectively.
The correct answer is D)which sort he needed
An action in a sentence can be represented in two ways, namely active and passive voice.
The passive voice always uses the past participle form of the main verb irrespective of any tense. Only the auxiliary verbs depend upon the sentence given in active voice.
The correct answer is D)The DVD recorder has not been repaired.
Option D is correct as the given sentence is in active voice and to transform it into passive voice the subject of the given sentence (The mechanic) come in the place of the object and vice versa. Also, as the sentence is in the present perfect tense, 'been' is added.
The passive voice always uses the past participle form of the main verb irrespective of any tense. Only the auxiliary verbs depend upon the sentence given in the active voice.
The correct answer is A)The window is not going to be opened by the teacher.
Option A is correct as the given sentence is in active voice and to transform it into passive voice the subject of the given sentence (The teacher) comes in the place of the object and vice versa. Also, as the sentence is in the present continuous tense, 'be' is added.
Options B, C, and D are not correct as the helping verb 'are' cannot be used here as the subject of the transformed sentence is singular, 'be' is missing, and the past participle form of the main verb (open) is not used respectively.
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