VERB TENSES: SIMPLE PRESENT

                                                            

 1.  This is a tense used to express actions that take place in the present and with certain frecuency, that is every day, every morning etc.

.Affirmative: Subject+ verb( s/es)+ complement

       Ex: I play tennis every day

.Negative: Subject+ don´t/ doesn´t + verb( inf) + complement

       Ex: María doesn´t like to go to scholl everyday

.Interrogative: Do/ Does + subject+ verb(inf)+ complement

       Ex: Do you like watch tv all the days?

Tips: Do/ Don´t: I,you,we,they

         Does/Doesn´t: He,she,it

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PRESENT CONTINUOS

Is a tense that is used to express actions that occur in the present, at the same time thatis stating the phrase. The Present Continuous is formed with the present of the verb (to)be plus verb in gerund action Affirmative: Subject+ am/is/are+verb(ing) ...Negative: Subject+ am/is/are+not+verb(ing)....Interrogative: Am/is/are +Subject+Verb(ing) ......
HERE THERE ARE SOME EXERCISES: http://www.isabelperez.com/happy/tenses/present_cont.htm                      

EXAMPLE

PAST SIMPLE

It is a tense that is used to express actions which took place in the past, regardless of the time over the past in which they occurred.
Interrogative: Subject+ verb in past+ complement
Negative: Subject+ Didn´t+ verb(inf)+ complement
Affirmative: Did+ subject+ verb(inf)+complement

Tips: In the affirmative tenses you have to be carefully, because sometimes the verbs is regular or irregular.

REGULAR AND IRREGULAR VERBS

PAST CONTINUOS

It is a tense which express actions that took place in the past, but at a particular time.

http://lore2692.wordpress.com/grammar/english/past-continuous/

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PRESENT PERFECT

It is a tense used to express actions that have taken place in the past, but in the very recent past.


Affirmative: Subject+have/has+verb(participe).....
Ex: He has watched tv for two hours




Negative: Subject+ haven´t/ hasn´t +verb(participe)...
Ex: I haven´t gone to the school this week


Interrogative:Has/Have+subject+verb(participe)....
Ex: Has andy bought anything for the dinner?

IT COULD HELP YOU

PAST PERFECT

It is a tense that expresses actions that have taken place in the past, but in a less recent past than is expressed in the Present Perfect.
Interrogative: Had+ subject+ verb( past participe)....
Negative: Subject + had not+ verb( past participe)...
Affirmative: Subject+ had+ verb( past participe)....

there are some exercises:  
http://www.curso-ingles.com/ejercicios-test-ingles/past-perfect.php

WORKING WITH THE FUTURE

THERE ARE TWO KINDS OF FUTURE:


1.SIMPLE FUTURE: It is a tense used to express actions that will occur in the future, regardless of the time too.

2. NEAR FUTURE : It is a tense used to express actions that will take place in the future, but it is very near future the time when it is spoken.

http://www.englisch-hilfen.de/en/exercises/tenses/future.htm

COMPARISSON

BEFORE FINISH

Learning English is really important because it is an essential requirement for mostcompanies when hiring their staff. Knowing English opens many doors in the workplace.
Now you have to improve your english:

http://dictionary.cambridge.org/
http://www.lingolex.com/espan.htm
http://www.learnenglish.de/basicspage.htm
http://www.elearnenglishlanguage.com/ingles/vocabulario/basico.html