Was is an example of irregular verb. Was is the past form of be.
Here's the definition of irregular verb and regular verb.
IRREGULAR VERB
A verb that does not follow the usual rules for verb forms:
be, is, are/ was, were , been
REGULAR VERB
A verb that forms its past tense and past participle by adding -d or -ed to the base form: walk, walked, walked; shout, shouted, shouted.
It's an irregular verb.
irregular
Went is the past tense of go.Go is an irregular verb. Because the past tense is not formed by adding -ed ie goed is not correct. The past tense of go is a new word = went.You can say went is the irregular past of go.
The simple past of regular verbs is formed by verb + ed :The boys jumped in the lake.The simple past of irregular verbs depends on the verb. To be is irregular. Compare:The boys are good. (Simple Present)The boys were good. (Simple Past)
Here are some simple, common verbs and their past tense.Present - PastJump - JumpedLaugh - LaughedTalk - TalkedPlay - PlayedAsk - AskedWatch - Watchedregular verb past forms are made by adding -ed to the verb. Swim, run speak etc are not regular verbs they are irregular verbs.
"Fly" is an irregular verb. Its past tense is "flew" and its past participle is "flown."
"Began" is an irregular verb. Its past tense form does not follow the usual pattern of adding "-ed" to the base form of the verb.
regular or irregular
It's an irregular verb.
It's an irregular verb.
Regular Verb
irregular
It's an irregular verb.
To swim is an irregular verb.
It's an irregular verb.
It's irregular.
It's an irregular verb.