Simple Present Tense Usage

The simple present tense is used in following conditions
CASE -1 when there is habitual actions
Example
a) I brush my teeth every morning.
b) He always washes feet before sleeping.
c) She goes to park everyday.
d) He never forgets my birthday.
CASE-2  to express general/universal truth
Example
a) The sun rises from the east.
b) Water consists of oxygen and hydrogen.
c) Summer follows the spring.
d) water changes into vapours on heating.
CASE-3 to express facts which is true at present.
Example
a) He works in bank.
b) She teaches French in a school.
c) Just one train stops at this station.
d) My father wears glasses.
CASE-4 scheduled events in near future.(timetables/programmes/calender events)
Example
a) The train leaves at 6 pm in the evening.
b) The school close in June for summer holidays
c) The book fair opens in January.
d) The film show begins at 9.30 and ends at 12.30
CASE-5 Observations/declaration
Example
a) I hate this person
b) I love travelling.
c) The notice says "No Smoking"
d) The President declares the games open

NOTE- The following adverbs/adverbial phrases are often used in the simple present tense-
-often
-generally
-occasionally
-sometimes
-usually
-always
-rarely
-never
-ever
-everyday
-daily
-once a week/month/year