"Mail" is a regular verb. It follows the typical -ed pattern when forming past tense and past participle forms, such as "mailed" and "has mailed."
"Have" is an irregular verb in English.
It's irregular.
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.
No, "appeler" is a regular -er verb in French. It conjugates according to regular -er verb patterns.
"Fly" is an irregular verb. Its past tense is "flew" and its past participle is "flown."
regular or irregular
"Have" is an irregular verb in English.
It's irregular.
It's an irregular verb.
It's an irregular verb.
To swim is an irregular verb.
It's an irregular verb.
It's an irregular verb.
Ate is an irregular verb.
irregular
irregular
By is not a verb, so it is neither regular nor irregular.