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I usually go with the search and replace function on Word. For most verbs you will only need to change the suffix, and then with more calm go trough the irregular verbs changing them to the new ten...
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Source: https://writers.stackexchange.com/a/33393 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I usually go with the search and replace function on Word. For most verbs you will only need to change the suffix, and then with more calm go trough the irregular verbs changing them to the new tense. But! Be really attentive during the revision: you will probably find a lot of problems to solve and many parts of the text will need to be rewritten.