+The Future Tense expresses action or being as yet to come+.
+The Present Perfect Tense expresses action or being as completed at the present time+.
+The Past Perfect Tense expresses action or being as completed at some past time+.
+The _Future Perfect Tense _expresses action or being to be completed at some future time+.
+_Number _and _Person _of a verb are those modifications that show its agreement with the number and person of its subject+.
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