Foundation
English
Transformation of sentences
Tenses
Sentences
Question
Change the given sentence using the conditional 'unless', without changing the meaning of the sentence:
A hefty fine will be levied on him if he does not make the payment on time.
Unless he makes the payment on time, a hefty fine will be levied on him.
If and unless he makes payment on time, a hefty fine will not be levied on him.
Unless he does not make the payment on time, a hefty fine will be levied on him.
Unless a hefty fine is levied on him, he will the make payment on time.
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Solution
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The word-'unless' is used in the place of  "If ...not". 
The given sentence can also be restated as - A hefty fine will be levied on him unless he makes the payment on time. This is stated in option B. Hence, this is the correct answer.  

You may note that as per the original statement, the levying of a hefty fine is dependent on him not making the payment on time. In option B, this is reversed and hence, the meaning conveyed is different. So, this option is incorrect.
Option C is incorrect as it means the opposite of the given sentence. 
Option D is grammatically incorrect as both the words- 'unless' and 'If' are used in the same sentence and it conveys no meaning.