Keyword Analysis & Research: what is the past tense of error

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the past tense of error	1.03	0.1	1747	15	31
what	1.77	0.8	1727	23	4
is	1.97	0.2	7763	93	2
the	0.96	0.5	3279	42	3
past	0.15	0.2	7280	40	4
tense	1.02	0.7	6113	83	5
of	0.15	1	4674	74	2
error	1.75	1	6992	81	5

Keyword	CPC	PCC	Volume	Score
what is the past tense of error	0.85	0.7	9572	55