"Don't be late again, Mary. " he said.

他说：“玛丽，不要再迟到了。”

The teacher said, "Don't be late again, Mary."

老师告诉玛丽不要再迟到了。

I'll overlook your lateness this time, but don't BE late again.

你这次迟到我不计较，但是不要再迟到了。

I'll overlook your lateness this time, but don't be late again.

你这次迟到我不计较， 但是不要再迟到了。