The House That Jack Built

In my classes, I used this video as an introduction to relative clauses.  First, the students watched the video.  Then, I put on the board two sentences: "This is the house. Jack built the house" and the students had to combine the sentences into "This is the house that jack built".
We also did "This is the cat" "The cat killed the rat", "This is the cat that killed the rat".  This way we had one relative clause with "that" as the subject, and one relative clause with "that" as an object.
TESOL Ideas--Relative Clauses--English World 5