PRESENT SIMPLE

Begin to day I'll present some simple knowledge about English.I hope it'll make every body in K42c3 can improve English skill.If I have some mistakes ,I hope every body can help you repair and don't laugh me.Today our topic is present simple:
-Formula:
Subject+verb+Object.
*Attention:Verb have to suit with Subject.
-when subject is I,We,You,They use V(inf).
-When subject is he,she,it add s or es after verb:
+Verb finish by CH,O,S,SH,X,Z add es.For example: Watch->watches.
+Verb finish by Y.Y 'll change become I then add Es.VD:Fly->flies
+the others verb and common verb often add S.
*Exception:have->has
-Formula as negative:S+do/dose not+Vinf+O
-Formula as question:Do/Does +S+V inf+O.
*Use present simple:
-when describe common action repeat in present
-Tell about data technology or a truth always correct.VD:the sun raises in the east.
-Give some guide.VD:you show the way for a foreign people turn left or turn right
-tell about a habit in present.
*Some Adverb is used in present simple:never,some time,usually,often,some time,rarely,.....
tomorrow we 'll continue with topic about present continuous.I think Thanh'll present about this topic and I hope every body 'll attend and write so much.Thanks !!!

Thanks for your post. is there any simple exercise ?