Basic rules how to form the past and the past participle of the verbs.

4. By the way they combine, there are two
kinds of verbs: regular and irregular.
Regular verbs are those that retain the
same root in all its forms and have the
endings of their conjugation model (jump,
eat, live.)
Present Present Future
perfect
simple
jump salt- salt-é Salt-plowed
(model)
answer Contest-o Contest-e contest-are

5. Are considered regular verbs
have changes in their root in
some forms of spelling
ground only:
present Present future
perfect
simple
hunt hunt hunts hunting
catch catch catch cathing

6. Irregular verbs are those that
change the result in some time
or people, some endings are
different from the model of
conjugation or both happen at
once.

7. Irregular verbs are those that do not
retain the same root in all its forms, or
have different endings conjugation
model, or both.
To determine whether a verb is regular
or irregular enough to observe the
following:
First person singular present
indicative.
Third person singular simple present
perfect tense.
First person singular future indicative

8. Present Present Future
perfect
simple
jump jump jumped jumping
show show showed showing
walk walk walked walking

9.  English regular verbs change their form very little (unlike irregular verbs). The past tense and past participle of
regular verbs end in -ed, for example:
 work, worked, worked
 But you should note the following points:
 1. Some verbs can be both regular and irregular, for example:
 learn, learned, learned
learn, learnt, learnt
 2. Some verbs change their meaning depending on whether they are regular or irregular, for example "to hang":
 Regular hang, hanged, hanged to kill or die, by dropping with a rope around the neck
 irregular hang, hung, hung to fix something (for example, a picture) at the top so that the lower part is free
 3. The present tense of some regular verbs is the same as the past tense of some irregular verbs:
 Regular
 found, founded, founded
 Irregular find, found, found