PRESENT SIMPLE EXERCISES AFFIRMATIVE,NEGATIVE AND INTERROGATIVE

Extra practice units  3 and 4. 

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pres1.htm

http://www.english-room.com/negative_5.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=1277

 http://www.english-room.com/dodoes_5.htm