This is a presentation and series of handouts I spent a long time putting together but it follows my belief that it is valuable to combine communicative teaching with a focus on form and in particular "language chunks" - learning expressions that are useful in different contexts.
This N.Y. Times article is an interesting read on language chunks.
Each lesson focuses on a different language function where students use a language prompt and then respond to it using one of the given language chunks/expressions. Teachers can guide student use - not every chunk is a correct response and the usage / difference can be subtle.
Also see below - Language In Use. As well, Conversation Gambits.
Here is a sample of some of the 25 lessons in the full book.