1.  He is like a king, so to speak.
いわば、彼は王のようだ

3. So to speak, it is the quiet people that are the most dangerous.
言ってみるならば、物を言わない人々が最も危険だ

4. This project is on the edge , so to speak.
言わば、この計画は危険と隣り合わせだ

5. They are no longer the leaders, so to speak. The people do not respect them.
彼らはいわばもはやリーダーではない。人々は彼らを尊敬していない。