Inference-making can be broken down into making inferences about actions, events and state. Within each of these categories there are many different things that inferences can be made about.
This resource suggests what to ask inference questions about and gives examples of inference questions you can ask. It also provides suggested answer structures to use when modelling answers and for the children to use.
More at: http://www.thatboycanteach.co.uk/2018/01/questions-teaching-inference-comprehension.html