Makes is the first person singular form of make.
eg He makes good pancakes. My sister makes bad pancakes.
Make is an irregular verb because the past tense form does not end in -ed. There is a different word for the past tense.
make - made
Walk is a regular verb
walk - walked.
Shown is an irregular verb because shown is different to ending in -ed. Does shown end in -ed? No it doesn't end in -ed so which makes it an irregular verb.
"Have" is an irregular verb in English.
It's irregular.
regular or irregular
It's an irregular verb.
It's an irregular verb.
To swim is an irregular verb.
It's an irregular verb.
Ate is an irregular verb.
It's an irregular verb.
By is not a verb, so it is neither regular nor irregular.
irregular