A party may amend his pleading once as a matter of course at any time before a responsive pleading is served and prior to entry of an order of dismissal. No other reply or surreply submission shall be filed without leave of court, which will be granted only in exceptional circumstances.At the request of the Committee on Rules and Practice of the Judicial Conference of the. This document contains the Federal Rules of Civil Procedure to- gether with forms, as amended to December 1, 2014. The moving party may also file an opposition to any motion to strike or crossmotion. Rule 15 - Amended and Supplemental Pleadings (a) Amendments. There are generally no forms for the motion. You will need to prepare your own papers. Except for good cause shown, no motions seeking leave to add new parties or to amend pleadings to assert new claims or defenses may be filed after September. 310 (2002) motion to dismiss practice in the Massachusetts district and municipal courts was greatly expanded.