Questions Without the Auxiliary Verb

Do these questions confuse you? Think for a moment about what information you want. Is it about a person or about a thing? When the subject of the question is asked for we don't need an auxilliary verb.

Who teaches the children English at the school? Torrie Gruber teaches the children.
Who did the children see at the English class? The children saw Torrie Gruber.

Who sang 'The Wall'? Pink floyd sang that song.
What song did Pink Floyd sing? Pink Floyd sang 'The Wall'.

Still confused? Practice here!