Presente simple

Afirmativas
Para hacer el presente simple se debe agregar una "s" al final del verbo de la tercera persona del singular. Al resto de las personas, no se le agrega nada.

to eat
'comer' to talk
'hablar' to play
'jugar' to drink
'beber'
I eat talk play drink
You eat talk play drink
He/She/It eats talks plays drinks
We eat talk play drink
They eat talk play drink

Ejemplos:You work in a company 'Tú trabajas en una empresa'
He drinks a lot of water 'Él toma mucha agua'
Si el verbo termina en "y" cuando antes de ésta se sitúa una consonante se cambia ésta por una "i" y se le agrega la desinencia "es" en la tercera persona del singular.

to carry to study to copy
I carry study copy
You carry study copy
He/She/It carries studies copies
We carry studycopy
They carry study copy

He flies an airplane.
She studies for the test of tomorrow.
En cambio, si el verbo termina en O, CH, SH, X, SS o Z no se cambian estas terminaciones y se le agrega la terminación -es en la tercera persona del singular.

to wash to watch fix
I wash watch fix
You wash watch fix
He/She/It washes watches fixes
We wash watch fix
They wash watch fixEjemplos:

- She goes to the theater.

- He watches T.V.

verbo afirmativo

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[editar] Excepciones en conjugaciones de verbo afirmativa
Las excepciones son los verbos "to be", "to have", "can", "may", "must", que significan ser (o estar), haber (o tener), poder(con sentido de tener posibilidad o capacidad de hacer algo),poder(con sentido de tener permiso para hacer algo)

behave can may must
I am have can may must
You are have can may must
He/She/It is has can may must
We are have can may must
You are have can may must
They are have can may must

Los verbos to be y to have hicieron sus conjugaciones en tercera persona del singular de forma diferente, en cambio "can", "may" y "must" no agregaron desinencia alguna, porque también cumple el papel deauxiliar y necesitan el acompañamiento de un verbo para que puedan formar una oración.

NOTA: Los verbos to be y to have también pueden cumplir el papel de auxiliar.

[editar] Negativas
La conjugación negativa se hace con el verbo "to do" en negativo más el verbo en cuestión, que no sufre desinencia alguna. Se coloca don't (do not)después del sujeto y antes del verbo en todas lasconjugaciones, excepto con la de la tercera persona del singular, cuyo auxiliar es doesn't (does not)

Ejemplo de conjugación:

to sleep
I don't sleep
You don't sleep
He/She/It doesn't sleep
We don't sleep
They don't sleep

Ejemplos:

I don't like broccoli = No me gusta el brócoli. He doesn't sing in the shower = Él no canta en la ducha.

NOTA: Cuando va el auxiliar DOES en latercera persona al verbo se le quita lo añadido en la forma afirmativa.

[editar] Excepciones en conjugaciones de oraciones negativas
Con los verbos "to be", "to have", "to do", "can", "may", "must", "will" o "shall", "should", "could", "would" se le agrega la partícula "not" al final del verbo.

You|| are not|| have not|| do not || can not|| may not|| must not|| will not / shall not || shouldnot || could not || would not

to be to have to do can may must will o shall should could would
I am not have not do not can not may not must not will not / shall not should not could not would not
You are not have not do not can not may not must not will not should not could not would not
He/She/It is not has not does not can not may not must not will not should not could not would notWe are not have not do not can not may not must not will not / shall not should not could not would not
They are not have not do not can not may not must not will not should not could not would not

Recuerde que usualmente que estos verbos sufren contracciones como éstas:

Can not = Can't Must not = Mustn't Have not = Haven't Has not = Hasn't Are not = Aren't Is not = Isn't Would not =...