Had begun is the past perfect tense.
"You have begun" is correct.
No. The form "begun" of the verb to begin is a participle, and cannot be used without an auxiliary verb - normally was, had, or have, and conditionals such as could or should. The proper form here is the past tense,"began."
No, it is not. Begun is the past participle of the verb "to begin" and is a verb form in tenses such as the present perfect and past perfect.
No. The form "begun" of the verb to begin is a participle, and cannot be used without an auxiliary verb - normally was, had, or have, and conditionals such as could or should.
The word 'perform' is already a verb. 'Performance' would be the noun form.
Surprise is already a verb. As in "to surprise someone".
Respect is already a verb form. For example "to respect someone or something" is an action and therefore a verb.
Complete is already a verb. For example "to complete something" is an action and therefore a verb.
The correct phrase is "haven't begun." "Begun" is the past participle of the verb "begin," while "begin" is the base form. Therefore, when using "haven't" as a contraction for "have not," it should be followed by "begun."
Attract is already a verb. For example "to attract something or someone" is an action and therefore a verb.
Practice is already a verb. For example "to practice something" is an action and therefore a verb.
Extend is already a verb. For example "to extend something" is an action and therefore a verb.