Simple Present - Signal words

These words tell you what tense you have to use. For the Simple Present these are adverbs of frequency:

always
often
usually
sometimes
seldom
never

Other phrases of time can occur, like:
every day
every week
every year
on Mondays
after school

Form of the Simple Present

We use the infinitive of the verb. In the 3rd person Singular (he, she, it - or a name) we put an -s to the end of the infinitive.

infinitive - 3rd person Singular (he, she, it) infinitive + -s

Affirmative sentences:

I/we/you/they play football.
He/she/it plays football.

NOTE: he, she, it - Do not forget the -s.

Negative sentences:

We use the auxiliary do.
I/we/you/they do not play football.
He/she/it does not play football.

NOTE: We often use short forms in negative sentences in the Simple Present:
I/we/you/they don't play football.
He/she/it doesn't play football.

Questions:

Do I/we/you/they play football?
Does he/she/it play football?