Improve the sentence by selecting the appropriate tense of the underlined word. He work for an hour when I found him sleeping on the couch.
had worked
The sentence has two past actions: (1) his working for an hour and (2) my finding him sleeping ('found' — simple past).
The working was completed before the moment I found him; the duration 'for an hour' is measured up to that past moment. The earlier of two past actions takes the past perfect: had + past participle.
Correct sentence: He had worked for an hour when I found him sleeping on the couch.
'was working' would mean he was still working at the moment I found him, which cannot be true because he was sleeping; 'has worked' and 'will have worked' do not fit a past-time narrative.
Hence, the answer is had worked.
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