To rewrite the sentences, for the first pair, the correct format is 'If you walk fast, you'll catch the bus.' For the second pair, it becomes 'If you walk on the road, you will be fined.' This approach clearly states the condition at the beginning of the sentence.
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To address the student's question, let's first understand the given statements and how to transform them.
Rukku Manni's laughter is not explained directly in the question, but it might be inferred that she found humor in the contradictions or the combination of circumstances described in the sentences.
Next, let's focus on rewriting the sentences as a single sentence using 'if'.
(a) Original Pair:
Walk fast, you'll catch the bus.
If you are late, you'll catch the bus.
Rewritten as a Single Sentence with 'If':
"If you walk fast, you will catch the bus."
(b) Original Pair:
Don't walk on the road. You will be fined.
Rewritten as a Single Sentence with 'If':
"If you walk on the road, you will be fined."
Each transformation involves identifying the condition first and then adding what happens if that condition is met. This exercise helps improve understanding of conditional sentences in English by practicing how different scenarios are expressed with 'if' clauses.