he used to work better than he does now  =>....................................................

He used to work better than he does now means that in the past, his work performance was superior compared to his current performance. The phrase "used to" indicates that there has been a change over time.

In more detail, "he used to work better" suggests that at a previous point in time, he was more efficient, productive, or effective in his work. It implies that there has been a decline in his work quality or output. The phrase "than he does now" directly compares his past performance with his current performance, making it clear that his present situation is not as favorable as before.

The underlying reasons for this change could vary: it may involve personal issues, lack of motivation, changes in the work environment, health issues, or even changes in workload. This structure indicates a shift from a generally favorable condition to a less favorable one, focusing on a contrast between the past and present.