SN4 ""

No	Pattern	Freq
1	[pron] have been [noun prp]	228
2	[noun] have been [noun prp]	205
3	[vb mod] have been [noun prp]	182
4	[modal v] have been [noun prp]	182
5	[pers pn] have been [noun prp]	156
6	[noun sg] have been [noun prp]	121
7	it have been [noun prp]	100
8	it have been [noun prp]	100
9	[adv] have been [noun prp]	57
10	[adv] have been [noun prp]	45
11	[noun prp] have been [noun prp]	44
12	must have been [noun prp]	43
13	must have been [noun prp]	43
14	[noun pl] have been [noun prp]	40
15	[adj] have been [noun prp]	39
16	could have been [noun prp]	38
17	could have been [noun prp]	38
18	[verb] have been [noun prp]	35
19	[Wh pn] have been [noun prp]	32
20	who have been [noun prp]	31
21	who have been [noun prp]	31
22	would have been [noun prp]	30
23	might have been [noun prp]	29
24	might have been [noun prp]	29
25	would have been [noun prp]	29
26	[det] have been [noun prp]	28
27	may have been [noun prp]	26
28	[conj] have been [noun prp]	26
29	may have been [noun prp]	26
30	he have been [noun prp]	24