While "share" is a regular verb, "shared" is the past tense form, making it an irregular verb. This is because the past tense of "share" does not follow the regular -ed ending.
Here's how it works:
* Present Tense: share
* Past Tense: shared
* Past Participle: shared
* Present Participle: sharing
So, while "share" itself is regular, its past tense and past participle forms are considered irregular.