That was 4 years ago.
1	That	that	PRON	DT	Number=Sing|PronType=Dem	5	nsubj	5:nsubj	_
2	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	5	cop	5:cop	_
3	4	4	NUM	CD	NumForm=Digit|NumType=Card	4	nummod	4:nummod	_
4	years	year	NOUN	NNS	Number=Plur	5	obl:npmod	5:obl:npmod	_
5	ago	ago	ADV	RB	_	0	root	0:root	SpaceAfter=No
6	.	.	PUNCT	.	_	5	punct	5:punct	_
