SN4 ""

No	Pattern	Freq
1	[vb mod] have been [adj] [to-vb]	689
2	would have been [adj] [to-vb]	467
3	[vb mod] have been able [to-vb]	185
4	might have been [adj] [to-vb]	73
5	[vb mod] have been [adj] to have	64
6	may have been [adj] [to-vb]	42
7	should have been [adj] [to-vb]	41
8	must have been [adj] [to-vb]	38
9	[vb mod] have been difficult [to-vb]	32
10	[vb mod] have been happy [to-vb]	30
11	[vb mod] have been unable [to-vb]	28
12	[vb mod] have been nice [to-vb]	27
13	[vb mod] have been impossible [to-vb]	23
14	[vb mod] have been [adj] to see	22
15	'd have been [adj] [to-vb]	21
16	[vb mod] have been prepared [to-vb]	19
17	[vb mod] have been hard [to-vb]	18
18	[vb mod] have been easy [to-vb]	17
19	[vb mod] have been [adj] to make	16
20	[vb mod] have been delighted [to-vb]	15
21	[vb mod] have been possible [to-vb]	15
22	[vb mod] have been willing [to-vb]	14
23	[vb mod] have been [adj] to give	12
24	[vb mod] have been [adj] to get	12
25	[vb mod] have been interesting [to-vb]	11
26	[vb mod] have been [adj] to accept	11
27	[vb mod] have been [adj] to do	11
28	[vb mod] have been [adj] to hear	11
29	[vb mod] have been unlikely [to-vb]	11
30	[vb mod] have been [adj] to go	10