SN4 ""

No	Pattern	Freq
1	[pron] have been [det]	1456
2	there have been [det]	1191
3	there have been [det]	1191
4	[ex0] have been [det]	1191
5	[modal v] have been [det]	370
6	[vb mod] have been [det]	370
7	[noun] have been [det]	266
8	[pers pn] have been [det]	231
9	[adv] have been [det]	181
10	[noun sg] have been [det]	160
11	it have been [det]	111
12	it have been [det]	111
13	would have been [det]	102
14	[adv] have been [det]	99
15	would have been [det]	95
16	must have been [det]	93
17	must have been [det]	93
18	not have been [det]	82
19	[not/n't] have been [det]	82
20	[verb] have been [det]	75
21	could have been [det]	63
22	could have been [det]	63
23	[noun pl] have been [det]	62
24	may have been [det]	49
25	may have been [det]	49
26	n't have been [det]	44
27	[noun prp] have been [det]	42
28	seem have been [det]	40
29	not have been [det]	38
30	there have been [det]	37