The phrase "alter modify" is not correct as it is redundant; both words convey similar meanings.
You can use it when discussing changes or adjustments, but it is better to choose one term to avoid repetition.
Example: "We need to alter the design to better fit the client's needs."
Alternatives: "change" or "adjust".
The present study illustrates the efficacy of using surface modifiers, or simply surfactants, to alter, modify, or control the nature of interfaces and film morphology in order to control physical properties in magnetic multilayers.
If the Secretary makes a determination that the financial condition of a taxpayer with whom the Secretary has entered into an agreement under subsection (a) has significantly changed, the Secretary may alter, modify, or terminate such agreement.
The governor, by and with advice and consent of the said legislative council, or of a majority of them, shall have power to alter, modify, or repeal the laws which may be in force at the commencement of this act.
"(A) In general. If the Secretary makes a determination that the financial condition of a taxpayer with whom the Secretary has entered into an agreement under subsection (a) has significantly changed, the Secretary may alter, modify, or terminate such agreement.
Nothing contained in this section shall be regarded as limiting, denying, or restricting the power of the Attorney General to correct, reopen, alter, modify, or vacate an order naturalizing the person.
By § 34, if different or additional evidence is introduced by the plaintiff upon the trial, the court, before rendering judgment, is required, unless the parties stipulate otherwise, to transmit a copy of the evidence to the commission, which may alter, modify, amend, or rescind its order and report its action to the court.
This system was altered, modified and expanded over the years by several authors.
Then there was the matter of syntax: my own ordinary, everyday sentence -- fragmented, interjecting, overriding -- also wouldn't do; it had to be altered, modified, brought under control.
The laws in force in the said territory, at the commencement of this act, and not inconsistent with the provisions thereof, shall continue in force, until altered, modified, or repealed by the legislature.
This Agreement shall bind You and GNM and their respective successors in business and assigns and cannot be changed altered modified or cancelled save by written agreement between the parties hereto and shall be governed and interpreted in accordance with the laws of England and the High Court of Justice in England shall be the exclusive Court of Jurisdiction.
The laws in force in the said district of Louisiana, at the commencement of this act, and not inconsistent with any of the provisions thereof, shall continue in force until altered, modified or repealed by the governor and judges of the Indiana territory, as aforesaid.
