period must have begun or period should began ?

period must have begun vs period should began

The correct phrase is "period must have begun." The modal verb "must" is used to express necessity or strong probability, while "have begun" is the correct past participle form of the verb. On the other hand, "period should began" is incorrect due to the mismatch between the modal verb "should" and the incorrect past tense form of the verb.

Last updated: March 26, 2024

period must have begun

This phrase is correct and commonly used in English.

This phrase is used to express a strong necessity or high probability that a period started in the past.

period should began

This phrase is incorrect in English.

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period must have begun vs period should began