This is a powerpoint about "will be able to". It starts with a couple of question for revision of "can / could". It includes some examples for presentation of grammar topic then it goes on with different ideas for practice and production. You can use post-it notes for the activity which students see a picture, write a sentence about the picture and run to the board and paste their sentence on the board. And give them a worksheet (fill in the blanks or matching etc.) for concept checking.
