So now that you know where to find the past participle of any verb, you just need to make sure you know what a past participle is. Just think of it as the one that goes with “have.” Today I swim. Yesterday I swam. In the past I have swum. Today I write. Yesterday I wrote. In the past I have written. Today I sleep. Yesterday I slept. In the past I have slept. Today I rise. Yesterday I rose. In the past I have risen.
But be warned. If you look up a verb like “walk” in some dictionaries, you’ll get no such help. “Webster’s New World College Dictionary” contains no “walked” or “walking” after its main entry for “walk.”
Does that mean your job just got harder? On the contrary, it just got easier.
“Webster’s New World’s” guide to using the dictionary says, “this dictionary usually shows only those inflected forms that are irregular or that present specific difficulties. Regular inflected forms are usually not shown.”