Answers

2015-08-08T16:11:39+05:30
Simple present- sub. + V1 form of verb .
eg. he plays football.
simple past - sub. + V2 form of verb
eg. he played football.
simple future - sub. + will or shall + V1
eg. he will play football.

present continuous- sub. + am or is or are + ing form of verb
eg. he is playing football.
past continuous - sub. + was or were + ing
eg. he was playing football.
future continuous- sub. + will or shall + be + ing
eg. he will be playing football.

present perfect - sub. + has or have + p.p
eg. i have finished my homework.
past perfect- sub. +had + p.p
eg. i had reached the school when the bell rang.


etc..........
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2015-08-08T18:12:14+05:30
Basically there are 3 types of main tenses which are
Past Tense - Tenses which had happened before the time of speaking
Present Tense -  Tenses which is happening at the time of speaking
Future Time - Tenses which will happen after the time of speaking
Now these tenses are again divided into four as
Simple
Continuous
Perfect 
Perfect Continuous
So in all we have 12 tenses.
Hope it helps and pls mark it as the best answer. :-)
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