Rumus simple present tense:
+) S + V1/Vs/Ves + O + Time Signal
-) S + don't/doesn't + V1 + O + Time Signal
?) Do/Does + S + V1 + O + Time signal
-?) Don't/Doesn't + S + V1 + O + Time Signal + ?
e.g:
Mary Sings a song on the stage every night
