An
Irregular Verb is one that does not form its simple past tense or its past participle by adding "-
ed" or "-
d" to the base form.
For example, the past tense of the verb eat is not eated; it is ate. The past tense of fall is not falled; it is fell.
The Simple Past tense describes a completed activity that happened in the past.
For example:
Peter forgot his book.
Sarah froze the fish.