My teacher is the lady who is wearing blue skirt.

My teacher is the lady wearing blue skirt.

Who spoke to you?  Who did you speak to?

The man. He is standing by the door.

The man who is standing by the door spoke to me.

The man standing by the door spoke to me.

Who was your primary school classmate? The girl. The girl is sitting in the middle.

The girl who is sitting in the middle was my primary school classmate.

The girl sitting in the middle was my primary school classmate.

Who painted the picture? The boys. The boys are studying in nice middle school.

The boys who are studying in nice middle school painted the picture

The boys studying in nice middle school painted the picture.

The boys from nice school painted the picture.

Who made the travel plan? The teacher. The teacher wrote articles for travel magazines.

The teacher who wrote articles for travel magazines made the travel plan.