It's an auxiliary verb (for the Future Simple) and a modal verb, with no present Past or Past Participle forms (although SHOULD might have been a Past form in the past, so to speak). )
The modal verbs do not have past participles: * can * may * must * shall * will
The correct phrase is "shall be run." In this context, "run" is the past participle of the verb "to run," and it is used in passive constructions. "Shall be ran" is incorrect because "ran" is the simple past tense, not the past participle.
discussed because it will be past tense in the future
The past participle of do is done. The past participle of have is had.
Present Perfect: have (has - for the 3rd pers sing) + the verb's 3rd form (the [Past] Participle). Past Perfect: had + the verb's 3rd form (the [Past] Participle). Future Perfect: will (shall) + have + the verb's 3rd form (the [Past] Participle). Past (or Perfect) Conditional: would +have + the verb's 3rd form (the [Past] Participle). Past Subjunctive (Analytical): should + have + the verb's 3rd form (the [Past] Participle). Perfect Infinitive: to have + the verb's 3rd form (the [Past] Participle). Perfect Gerund (also called Present Participle): having + the verb's 3rd form (the [Past] Participle).
The past participle of am is been. Not does not have a past participle
What is the past participle of do
The past participle of have is had....:) I have had...
The past participle is had.
The past participle is willed.
The past participle is been.
Being is the present participle. The past participle is been.