Hi, Only a verb can have a past participle form. 'Straight-forward' is not a verb. It's an adjective.
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allthewayanime I would like to know when the past participle can't be used. --For instance:--
e.g. She's a very straight-forwarded girl.
(I know that's incorrect but I want to know why) The answer is that the correct word is straightforward. (one word)