He's been waiting for you since eight o'clock.
1	He	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	SpaceAfter=No
2	's	be	AUX	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	been	be	AUX	PERF	Tense=Past|VerbForm=Part	4	aux	_	_
4	waiting	wait	VERB	ING	Tense=Pres|VerbForm=Part	0	root	_	_
5	for	for	ADP	_	_	6	case	_	_
6	you	you	PRON	PERS-P2	_	4	obl	_	_
7	since	since	ADP	_	_	8	case	_	_
8	eight	eight	NUM	ID	NumType=Card	4	obl	_	_
9	o'clock	o'clock	ADV	_	_	8	advmod	_	SpaceAfter=No
10	.	.	PUNCT	Period	_	4	punct	_	_
