1. Hardly ever I work overtime. - Hardly ever do I work overtime.
2. Prof. Harris, that is an expert on bacteria, will give the lecture. - Prof. Harris, who is an expert on bacteria, will give the lecture.
3. Please don't change the channel yet. I watch this show. - Please don't change the channel yet. I am watching this show.
4. He doesn't found a new job yet. - He hasn't found a new job yet.
5. She has been sick for a month by the time she went to the doctor. - She had been sick for a month by the time she went to the doctor.
6. This city would be small, but it's grown a lot. - This city was small, but it has grown a lot.