Here one finds the very basic structure of continuous tense.
Structure of Present continuous....Am/Is/Are+any principal verb +ing.
Structure of past continuous... Was/Was+any principal verb+ing.
Structure of future continuous... Shall be/Will be+any principal verb+ing.
Structure of present perfect continuous...have/has+been+any principal verb +ing.
Structure of past perfect continuous..had+been+any principal verb+ing.
Structure of future perfect continuous.. Shall have/will have +been+ any principal verb+ing.
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