Perhaps it depends on whether the discussion is about spelling or about constructions. There isn't really a whole lot you can say about the formation of the simple present and the simple past. When two or more words are required to form a tense, it becomes more interesting.
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workmanIs there a reason for this?
workmansometimes the rule for tenses such as past simple is written as base form + ed while in the present perfect the verb + ed is referred to as the past participleThe past is usually called the -ed form and the past participle is the -en form, even when those are not the endings, as in the case of many irregular verbs and all regular verbs.