The Learning Exchange (Student Achievement Division, Ministry of Education) is a deep source of professional learning content for teachers with the huge added benefit of examples and demos that are in the context of Ontario classrooms and the Ontario curriculum.
On The Learning Exchange site you can see Ontario teachers using read-alouds http://thelearningexchange.ca/tag/read-aloud/ for a variety of purposes. The video below is the 5 m clip on Read Aloud from the Snapshots of Effective Practice series.
From Fisher, D., Flood, J., Lapp, D., & Frey, N. (2004). Interactive read-alouds: Is there a common set of implementation practices? The Reading Teacher, 58.1
Areas that the non-expert teachers struggled wth: