Tenses are of different types
present tense
simple present 
present perfect
present continious 
present perfect continious

past tense
simple past 
past perfect 

future tense
simple futue
future perfect
future continious

i am reading book -present tense
i was reading book-past tense
i will read book-future tense
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Tense is of three main types: Past, Present and Future. These main types are divided into four: Simple, Continuous, Perfect and Perfect continuous. All tenses are Simple past, past continuous, past perfect, past perfect continuous, simple present, present continuous,present perfect, present perfect continuous, simple future, future continuous, future perfect, future perfect continuous. Example of one tense: I am writing. This is present continuous tense. Hope u understood and i hope this helps... all the best.!! :) ;)
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