What do you mean by the sequence of tenses?

Tense is a grammatical term referring to time of occurance. Thus, past, present and future are the principal tenses. Each Tense is subdivided into perfect, indefinite and continuous. arranging the verb forms in proper sequence according to Tense is sequence of tenses. Thus sequence of 'go' is go, went gone. 

The sequence of tenses is the principle in accordance with which the tense of the verb in a subordinate clause follows the tense of the verb in the principal clause.The sequence of tenses applies chiefly to adverb clauses of purpose and noun clauses
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dnt knw

Tenses are divided into past present and future tenses and you should these tenses accordingly.