Present Simple Ingles

PRESENT SIMPLE
Form of the present simple

Forming a sentence in the Present Simple is easy. To form a declarative sentence, all you need is the subject of the sentence (e.g. I, you, he, a dog) and the main verb (e.g. be, talk, swim). Questions and negative sentences are only a little more difficult, because they require an auxiliary verb (do – does).
SUBJECT +AUXILIARY VERB + MAIN VERB
(I, you, he, she, it, you, we, they)+ DO/DOES+ Base
  | subject | auxiliary verb |   | main verb |   |
+ | I, you, we, they | |   | like | coffee. |
| He, she, it | |   | likes | coffee. |
- | I, you, we, they | do | not | like | coffee. |
| He, she, it | does | not | like | coffee. |
? | Do | I, you, we, they |   | like | coffee? || Does | he, she, it |   | like | coffee? |

Affirmative:
I/You/We/They cook
He/She/It cooks
Interrogative:
Do I/You/We/They cook?
Does She/he/It cook?
Negative:
Long formShort form
I/You/We/They do not don´t cook
She/he/It does not doesn´t cook

There are three important exceptions:
1. For positive sentences, we do not normally use the auxiliary.
  | subject | main verb |   |   |
+ | I | am |   | French. |
| You, we, they | are |   | French. |
| He,she, it | is |   | French. |
- | I | am | not | old. |
| You, we, they | are | not | old. |
| He, she, it | is | not | old. |
? | Am | I |   | late? |
| Are | you, we, they |   | late? |
| Is | he, she, it |   | late? |

2. For the 3rd person singular (he, she, it), we add s to the main verb or es to the auxiliary.
He/she/it | does | has | | reads | likes | | |

In thiscategory we must study this spelling:
Be careful with some words when using the 3rd person singular.
a) verbs ending in a sibilant [s] [z] [ʃ] [ʒ] [ʧ] [ʤ] or -s / -sh/ -ch:- or verbs ending in -o preceded by a consonant
We add -es to the infinitive.
Examples:
I watch - he watches
I pass - he passes
I go - he goes
I do - he does
b) verbs ending in -y
verbs ending in 'y' preceded by a vowel(a, e, i, o, u): Add -s.
Example: 
I play - he plays
verbs ending in 'y' preceded by a consonant: Change 'y' to 'i' and add 'es'.
Example: 
I hurry - he hurries
3. We find special verbs, we must be carefull:
1) have as a full verb |
affirmative sentence | negative sentence | question |
I, we, you, they: |
I have a book. | I do not have a book. | Do I have a book? |
he, she, it:|
He has a book. | He does not have a book. | Does he have a book? |

2) be as a full verb. We do not use an auxiliary, even for questions and negatives |
affirmative sentence | negative sentence | question |
I am from Britain. | I am not from Britain. | Am I from Britain? |
he, she, it: |
He is from Britain. | He is not from Britain. | Is he from Britain? |
we, you, they: |We are from Britain. | We are not from Britain. | Are we from Britain? |
We often use the short forms with this verb.
3) do as a full verb |
affirmative sentence | negative sentence | question |
I, we, you, they: |
I do an exercise. | I do not do an exercise. | Do I do an exercise? |
he, she, it: |
He does an exercise. | He does not do an exercise. | Does he do an exercise? |

4) modalauxiliaries can, could, may, must, need, will etc. |
affirmative sentence | negative sentence | question |
every time regardless the subject (I, he, she, it, we, you, they): |
I can play tennis. | I can not play tennis. | Can I play tennis? |
NOTE:
We can subtitute don't (can't) for do not (cannot).
Modals have the same form every time regardless the subject. We do not add an -s to the...