English Language Guide: Tense

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Verb phrases can vary with tense, in which case they are called "tensed verb phrases."
Example:
There are many non-tensed forms as well:The time frame of a non-tensed verb phrase is determined by examining that of the main clause verb. Examples:In the first case, the time frame (past) of "practicing" is determined by "was" in the main clause; in the second, the time frame (present and future) of "practicing" is determined by "will in time," also in the main clause.