once they completed vs once they are completed

Both phrases are correct, but they are used in different contexts. 'Once they completed' is used when referring to actions that have already been finished by a specific group of people. 'Once they are completed' is used when referring to actions that will be finished in the future. Therefore, the choice between the two depends on the tense and context of the whole sentence.

Explained by Jennifer
Editor at TextRanch

Last updated: March 15, 2025 • 5563 views

This phrase is correct when referring to actions that have already been finished by a specific group of people.

"once they completed"

This phrase is used to indicate that a particular group of people has finished a task or activity. It is in the past tense.

Examples:

Once they completed the project, they celebrated their success.
Once they completed their training, they were ready for the competition.

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Whilst these forms give the impression that entry is free, once they are completed and signed, the businesses actually enter a contract which requires them to pay fees.
To do away with all these cooperation projects and give countries EUR 1 million once they have completed this specific democratisation reform.
Once they are completed, the landing sites for our breeding ships will be ready.
The problem has been the under-capacity of countries to continue projects once they were completed by the European Union.
In Spain teachers, once they have completed their training, are recruited in the public service by way of competitions.
The Parties shall notify each other once they have completed the internal procedures required for this Agreement to enter into force.
Once they have completed the construction of a new polder, they suddenly find that a dike is much too low and they immediately have to set to work on it.
I also hope that Parliament's assent will be sought before negotiations are opened, and not once they have been completed.
Pre-issued certificates shall only be valid once they have been completed and a copy of the certificate is transmitted to the issuing management authority by the applicant.';
In those cases such capital instruments should only be computed towards the institution's Additional Tier 1 capital or Tier 2 capital once they have successfully completed these approval processes.
Holders of a LAPL(A) shall only carry passengers once they have completed 10 hours of flight time as PIC on aeroplanes or TMG after the issuance of the licence.'
Studies have been carried out in some Member States in order to determine how higher education institutions have adapted to the new labour market requirements and what prospects graduates have of finding work once they have completed their degree course.
Coulter: Once they had completed the crime scene investigation, her body had been removed by the coroner's office. Susan's possessions were released to Sareb Kaufman, who was the only family that she had there that they could find.
Once completed, they and my brother will be out of our lives forever.
As a result, many buildings have been erected without authorisation in wooded areas, more often than not on public land; once completed, they are declared legal.
Once completed, it should cover some 40 states and around 700 million consumers.
Once completed, the database will be a further source of authoritative information about medicines for patients, healthcare professionals and regulators.
Once completed, these training programmes allow students to gain a nationally recognised VET qualification.
Council Regulation (EC) No 1164/94 of 16 May 1994 establishing a Cohesion Fund does not assign any competence to the Commission to monitor the operation of a project once completed.
And a banking union, once completed, should contain the risk of financial crisis and contagion.

Alternatives:

once they finished
once they concluded
once they accomplished
once they wrapped up
once they ended

This phrase is correct when referring to actions that will be finished in the future.

"once they are completed"

This phrase is used to indicate that a particular group of people will finish a task or activity. It is in the future tense.

Examples:

Once they are completed with the renovations, they can move into the new house.
Once they are completed with the training, they will be able to start their new jobs.

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Whilst these forms give the impression that entry is free, once they are completed and signed, the businesses actually enter a contract which requires them to pay fees.
Once they are completed, the landing sites for our breeding ships will be ready.
Because once these projects are completed, the question is whether or not those people are still needed.
But once his tests are completed, he's free to go.
Once completed, it should cover some 40 states and around 700 million consumers.
Once completed, the database will be a further source of authoritative information about medicines for patients, healthcare professionals and regulators.
Once completed, these training programmes allow students to gain a nationally recognised VET qualification.
To do away with all these cooperation projects and give countries EUR 1 million once they have completed this specific democratisation reform.
The problem has been the under-capacity of countries to continue projects once they were completed by the European Union.
In Spain teachers, once they have completed their training, are recruited in the public service by way of competitions.
The Parties shall notify each other once they have completed the internal procedures required for this Agreement to enter into force.
Our tactical subprocessors indicate a 79 percent likelihood that a rescue will be attempted once sufficient repairs are completed.
The Commission and the Council of Ministers will be in a position to draw their own political conclusions once these negotiations are completed.
Once negotiations are completed, the countries that have done so will be participants with equal rights in the Intergovernmental Conference, and, moreover, right from the word go.
I also hope that Parliament's assent will be sought before negotiations are opened, and not once they have been completed.
Council Regulation (EC) No 1164/94 of 16 May 1994 establishing a Cohesion Fund does not assign any competence to the Commission to monitor the operation of a project once completed.
And a banking union, once completed, should contain the risk of financial crisis and contagion.
Once completed, they and my brother will be out of our lives forever.
Correcting incomplete or inaccurate data is an administrative act which, once completed, will allow vessels to appear on the list specified.
People say that the federal construction, once completed, will be more effective than the Europe of the nations.

Alternatives:

once they finish
once they conclude
once they accomplish
once they wrap up
once they end

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once they completed vs once they are completed

"once they completed"

"once they are completed"

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