Regular.
Yes, "pray" is considered an irregular verb because its past tense form is "prayed" rather than the regular "-ed" ending as in most verbs.
Preach is a regular verb so the past participle is preached
Yes, "worship" is a compound word formed by combining the words "worth" and "ship".
The past tense of "worship" is "worshipped" in British English or "worshiped" in American English.
Jews typically worship in synagogues. These are places of communal prayer, study, and assembly for Jewish individuals and communities.
"Have" is an irregular verb in English.
It's irregular.
regular or irregular
It's an irregular verb.
It's an irregular verb.
Ate is an irregular verb.
It's an irregular verb.
It's an irregular verb.
To swim is an irregular verb.
irregular
irregular
By is not a verb, so it is neither regular nor irregular.