The worker cut down the trees in this forests.(改为否定句）

The worker cut down the trees in this forests.(改为否定句）
The worker cut down the trees in this forests.(改为否定句）

The worker cut down the trees in this forests.(改为否定句）
The worker didn't cut down the trees in this forests.
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The worker didn' t cut down the trees in this forests

The worker didn't cut down the trees in this forests.
the worker 后不会跟动词原形，因此cut是过去式