Rule V: f/t-insertion

	V.	Abbreviation:	f/t-insertion
		Description:	f/t-insertion for strong verbs whose verb primitive ends on "f" or "t" (double "f", respectively double "t")
		Example verb:	8.	greifen
		Application:	-	only valid for strong verbs
			-	the verb primitive ends on "f" or "t"
			-	the verb’s basis is "ei" or "au" (e.g. "greifen" or "saufen")
			-	the rule only applies if the Präteritum is not built with "ie" (e.g. not valid for "laufen", as this becomes "lief" and not "lieff")
			-	the Indikativ Präteritum, Konjunktiv II (Präteritum) as well as Partizip II forms receive an additional "f", respectively "t"

		Applies for (weak verbs):
			Präsens:	-
			Präteritum:	-
			Konj II (Prät):	-
			Imperativ:	-
			Partizip:	-
		Applies for (strong verbs):
			Präsens:	-
			Präteritum:	all forms
			Konj II (Prät):	all forms
			Imperativ:	-
			Partizip:	always
		Example:
			Präteritum:	"du griffst", not "du grifst"

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also see:
Overview - verb-irregularities