Rule II:   ~es - e-insertion

	II.	Abbreviation:	~es
		Description:	e-insertion in Indicative, Present, Singular III
		Example verb:	3.	to go
		Application:	-	the verb ends on "ch", "sh", "o", "s", "x" or "z"
			-	in Indicative Present, Singular III an "e" is inserted

		Validity:	Present:	Singular III
			Past:	-
			Imperative:	-
			Present Participle:	-
			Past Participle:	-
		Examples:	Present, Sing III:	"he goes", not "he gos"

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also see:

Verb-irregularities - overview