Sentence improvement – sequence of past events with relative clause: Replace 'which he bought yesterday' with past perfect to show earlier purchase relative to 'I took'.

Given data

• Original: 'I took the cycle which he bought yesterday.'

Concept/Approach
When one past action clearly precedes another past action, use the past perfect for the earlier action: 'he had bought (earlier), I took (later).' Also, 'that' is preferred in restrictive relative clauses after nonhuman antecedents.

Improved sentence
'I took the cycle that he had bought yesterday.'

Option analysis
'that he bought' misses the earlier-time nuance; 'that which he had bought' is wordy and unidiomatic; 'No improvement' ignores tense sequencing.