The most reliable way to study a conversational interjection is by examining cases of actual use.
1	The	the	DET	DT	Definite=Def|PronType=Art	4	det	4:det	Discourse=explanation-justify:118->121:3|Entity=(145-abstract-new-cf1-4-sgl
2	most	most	ADV	RBS	Degree=Sup	3	advmod	3:advmod	_
3	reliable	reliable	ADJ	JJ	Degree=Pos	4	amod	4:amod	_
4	way	way	NOUN	NN	Number=Sing	12	nsubj:outer	12:nsubj:outer	_
5	to	to	PART	TO	_	6	mark	6:mark	Discourse=purpose-attribute:119->118:0
6	study	study	VERB	VB	VerbForm=Inf	4	acl	4:acl:to	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	9:det	Entity=(146-abstract-new-cf2-3-sgl
8	conversational	conversational	ADJ	JJ	Degree=Pos	9	amod	9:amod	_
9	interjection	interjection	NOUN	NN	Number=Sing	6	obj	6:obj	Entity=146)145)
10	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	cop	12:cop	Discourse=same-unit_m:120->118:1
11	by	by	SCONJ	IN	_	12	mark	12:mark	_
12	examining	examine	VERB	VBG	VerbForm=Ger	0	root	0:root	_
13	cases	case	NOUN	NNS	Number=Plur	12	obj	12:obj	Entity=(147-event-new-cf3-1-sgl
14	of	of	ADP	IN	_	16	case	16:case	_
15	actual	actual	ADJ	JJ	Degree=Pos	16	amod	16:amod	Entity=(148-event-new-cf4-2-sgl
16	use	use	NOUN	NN	Number=Sing	13	nmod	13:nmod:of	Entity=148)147)|SpaceAfter=No
17	.	.	PUNCT	.	_	12	punct	12:punct	_
