Rule II: e2, e-insertion

	II.	Abbreviation:	e2
		Description:	e-insertion for verbs, whose verb primitive ends on "m" or "n"
		Example verb:	5.	atmen
		Application:	-	the verb primitive ends on "m" or "n"
			-	the preceding character is not "h" (exeption "ch"), "l", "m", "n", "r" or a vocal
			-	all verb extensions that start with a consonant receive an additional "e" in order to avoid building double consonants (e.g. "du atmest", not "du atmst" or "ihr atmet", not "ihr atmt").

		Applies for (weak verbs):
			Präsens:	Singular II, Singular III, Plural II
			Präteritum:	all forms
			Konj II (Prät):	all forms
			Imperativ:	Singular II, Plural II
			Partizip:	always
		Applies for (strong verbs):
			Präsens:	-
			Präteritum:	-
			Konj II (Prät):	-
			Imperativ:	Singular II, Plural II
			Partizip:	-
		Example:
			Präteritum:	"du atmetest", not "du atmtest"

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also see:
Overview - verb-irregularities