SN4 ""

No	Pattern	Freq
1	[vb mod] [adv] have [been] [det]	32
2	[modal v] [adv] have [been] [det]	32
3	may [adv] have [been] [det]	11
4	may [adv] have [been] [det]	11
5	could [adv] have [been] [det]	6
6	must [adv] have [been] [det]	6
7	could [adv] have [been] [det]	6
8	must [adv] have [been] [det]	6
9	[adv] [vb mod] have [been] [det]	10
10	[adv] [modal v] have [been] [det]	10
11	[adv] would have [been] [det]	7
12	[adv] would have [been] [det]	6
13	[adv] have [been] [prep] [det]	18
14	[adv] have [been] [prep] [det]	18
15	[adv] have [been] [adv] [det]	10
16	[adv] have [been] [adv] [det]	10
17	[adv] have [been] [art] [det]	8
18	[adv] have [been] [art] [det]	8
19	[adv] have [been] [verb] [det]	7
20	[adv] have [been] [adj] [det]	6
21	[adv] have [been] in [det]	6
22	[adv] have [been] in [det]	6
23	[adv] have [been] [vb pp] [det]	5
24	[adv] have [been] the [det]	5
25	[adv] have [been] the [det]	5
26	[adv] have [been] [det] [noun]	19
27	[adv] have [been] [det] [noun sg]	18
28	[adv] have [been] [det] [adj]	9