SN4 ""

No	Pattern	Freq
1	[vb mod] [adv] have [been] [noun]	132
2	[modal v] [adv] have been [noun]	132
3	[modal v] [adv] have [been] [noun]	93
4	[modal v] [adv] have [been] [noun sg]	61
5	[modal v] [not/n't] have [been] [noun]	39
6	[modal v] not have [been] [noun]	39
7	[modal v] [adv] have [been] [noun pl]	38
8	would [adv] have [been] [noun]	34
9	would [adv] have [been] [noun]	33
10	could [adv] have [been] [noun]	31
11	could [adv] have [been] [noun]	31
12	may [adv] have [been] [noun]	29
13	may [adv] have [been] [noun]	29
14	[modal v] [adv] have [been] [noun prp]	29
15	[modal v] not have [been] [noun]	27
16	might [adv] have [been] [noun]	22
17	might [adv] have [been] [noun]	22
18	[modal v] well have [been] [noun]	19
19	[modal v] well have [been] [noun]	19
20	[modal v] n't have [been] [noun]	12
21	[modal v] [adv] have [been] part	9
22	[modal v] [adv] have [been] part	9
23	[modal v] once have [been] [noun]	8
24	[modal v] once have [been] [noun]	8
25	[modal v] only have [been] [noun]	8
26	[modal v] only have [been] [noun]	8
27	[modal v] easily have [been] [noun]	6
28	[modal v] easily have [been] [noun]	6
29	[modal v] also have [been] [noun]	6
30	[modal v] also have [been] [noun]	6