Exercise: choose the correct form for specified verbs.
Simple present
1) We use the simple present for permanent situations and things that are generally true: The sun rises in the east.
2) We can use the simple present for habits, things that happen regularly, with verbs that describe current states and in informal reports or instructions: She is our English teacher.
3) We also use the simple present when we perform an action by speaking: I promise to be there by 5:30.
4) We use the simple present to express future time, after some conjunctions: She'll give it to you when you come next week.