N.Y. CVP Law § 3025

Rule 3025. Amended and supplemental pleadings. (a) Amendments without\nleave. A party may amend his pleading once without leave of court within\ntwenty days after its service, or at any time before the period for\nresponding to it expires, or within twenty days after service of a\npleading responding to it.\n (b) Amendments and supplemental pleadings by leave. A party may amend\nhis or her pleading, or supplement it by setting forth additional or\nsubsequent transactions or occurrences, at any time by leave of court or\nby stipulation of all parties. Leave shall be freely given upon such\nterms as may be just including the granting of costs and continuances.\nAny motion to amend or supplement pleadings shall be accompanied by the\nproposed amended or supplemental pleading clearly showing the changes or\nadditions to be made to the pleading.\n (c) Amendment to conform to the evidence. The court may permit\npleadings to be amended before or after judgment to conform them to the\nevidence, upon such terms as may be just including the granting of costs\nand continuances.\n (d) Responses to amended or supplemental pleadings. Except where\notherwise prescribed by law or order of the court, there shall be an\nanswer or reply to an amended or supplemental pleading if an answer or\nreply is required to the pleading being amended or supplemented. Service\nof such an answer or reply shall be made within twenty days after\nservice of the amended or supplemental pleading to which it responds.\n