SN4 ""

No	Pattern	Freq
1	[pron] have been a [adv]	239
2	[pers pn] have been a [adv]	160
3	[vb mod] have been a [adv]	148
4	[modal v] have been a [adv]	148
5	it have been a [adv]	100
6	it have been a [adv]	100
7	[noun] have been a [adv]	96
8	[noun sg] have been a [adv]	54
9	there have been a [adv]	54
10	there have been a [adv]	54
11	[ex0] have been a [adv]	54
12	would have been a [adv]	49
13	would have been a [adv]	47
14	must have been a [adv]	42
15	must have been a [adv]	42
16	[adv] have been a [adv]	32
17	[adj] have been a [adv]	31
18	[noun prp] have been a [adv]	29
19	[det] have been a [adv]	26
20	he have been a [adv]	26
21	he have been a [adv]	25
22	[verb] have been a [adv]	24
23	this have been a [adv]	24
24	this have been a [adv]	24
25	[Wh det] have been a [adv]	22
26	[adv] have been a [adv]	22
27	what have been a [adv]	18
28	could have been a [adv]	18
29	could have been a [adv]	18
30	what have been a [adv]	18