- The simple present tense is used to describe habitual actions.
- The present continuous tense describes an action in progress at the moment of speaking.
I'm shouting because I'm angry.
SIMPLE PRESENT OR PRESENT CONTINUOUS?
EXERCISES ON SIMPLE PRESENT AND PRESENT CONTINUOUS:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm
http://www.englishpage.com/verbpage/verbs1.htm
DO SOME MORE EXERCISES