Hi! I'm bringing you a presentation with the structure and uses of the modal verb can. Modal verbs are special because they don't take final -s for the thid person singular in present simple. Moreover, they have different syntax rules and structures other than verbs such as play, work, fly or read. We use can to express ability, possibilty and also to ask for permission or to ask for a favour.
I hope you will find the chart below useful.