Group 1
Group 1 is a little awkward here as we need to remember the following table.

Verbs in the plain form that end in う, つ or る change to った 修正
The verb いく (to go) is the only exception. It doesn’t go to いいた but changes instead to いった. Some examples are given in the table below.

Group 2
For Group 2 all you need do is change る to た and you’re done!

Group 3

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