They helped build vs They helped built

Some examples from the web:

• They helped build the lunar module.
• They helped build a nation.
• Together they helped Malek build the pool of sight.
• They want to continue to be a part of the social, political and cultural life of countries which they helped to build, and they desire to contribute to the common good of societies where they wish to be fully accepted as agents of peace and reconciliation.
• At times they are forced to leave the countries they have helped to build because of persistent tensions and policies which frequently relegate them to being second-class spectators of national life.
• The communities that they have helped to build up were based on the same elements as were found in the early Church: on the Apostles' teaching and fellowship, on the Eucharist and prayers.
• I helped build the Union Pacific.
• Your family's donations helped build this place.
• The Fairfields helped build this city.
• Davi Santos helped build T eam Cietro.
• So you helped build his empire.
• Your father helped build this school.
• I helped build this house a long time ago.
• Every access point, because he helped build them.
• He helped build it at Utopia Planitia.
• My father helped build Park Kultury there 50 years.
• I helped build it and I bled for it.
• I helped build all of this.
• Three hundred years ago you helped build a backwater pin colony into something.
• He cooked meals, helped build wells.

Some examples from the web:

• The Doré and San Lorenzo valleys offer a route to the Pedrotti Refuge that was followed by the "Sborzi", the nickname of the family of workers who helped to built the Tosa Refuge.
• I am happy to have this opportunity to express my thanks for the system of atmospheric and climatic control which you have designed, built and helped to install in the Sistine Chapel.
• They helped plant and harvest all the vegetables.
• They helped win independence for America.
• They helped you avoid being captured.
• Together they helped Malek build the pool of sight.
• I don't think they helped her at all.
• And figured out that they helped carry a baby to term.
• They helped me and Lee when we had problems.
• I once became a dog and they helped me.
• But they helped us when the boss wanted to send us away.
• She and Stuart - they helped get us home.
• Hope they helped you fall asleep.
• (laughs) Hope they helped you fall asleep.
• No, but they helped me understand.
• Or how they helped Batiatus to hold me to that house.
• They helped out with the cars rebirthing.
• They helped in achieving a better enforcement of a large number of directives protecting the environment.
• Looks like they helped Jackson bag a boar.
• Or they helped a boar bag Jackson.