1. was, while, walking, I, saw, to, I, a, in, cat, school, a, tree
                                                                              
2.  while, walking, was, car, the, exploded, past, I, it
                                                                              
3.  said, he, living , he, in, was, London
                                                                              
4. I, speaking, to, you, you, the, were, while, saw, teacher
                                                                              
5. I, at, TV, 8 p. m., was, yesterday, watching