SN4 ""

No	Pattern	Freq
1	[noun] have occurred	783
2	[noun sg] have occurred	557
3	[pron] have occurred	238
4	[noun pl] have occurred	202
5	[Wh det] have occurred	160
6	[modal v] have occurred	148
7	[vb mod] have occurred	148
8	[conj] have occurred	147
9	error have occurred	127
10	error have occurred	122
11	[adv] have occurred	117
12	that have occurred	117
13	that have occurred	117
14	[that] have occurred	117
15	which have occurred	109
16	which have occurred	109
17	[verb] have occurred	87
18	[adv] have occurred	77
19	[adj] have occurred	73
20	[pers pn] have occurred	67
21	it have occurred	59
22	it have occurred	59
23	what have occurred	50
24	what have occurred	50
25	[det] have occurred	48
26	change have occurred	43
27	this have occurred	41
28	this have occurred	41
29	not have occurred	40
30	[not/n't] have occurred	40