present simple describe things that are generally true describe something happening continually in the present describe something happening regularly in the present present continuous to describe something before and after the moment of speaking to describe a temporary situation to describe something happening before and after a given time modal describe something we are not sure about http://500ab102e3079df093a4-ff8eeadd950d51fd1fc939dca75b3973.r47.cf1.rackcdn.com/assets_green.swf