SN4 ""

No	Pattern	Freq
1	had been a [noun sg]	1477
2	has been a [noun sg]	1300
3	have been a [noun sg]	955
4	's been a [noun sg]	319
5	have been a [noun sg]	301
6	have been a lot	206
7	to have been a [noun sg]	181
8	have been a bit	176
9	have been a member	140
10	have been a number	130
11	'd been a [noun sg]	110
12	've been a [noun sg]	98
13	have been a mistake	65
14	have been a problem	54
15	having been a [noun sg]	53
16	have been a success	50
17	have been a tendency	46
18	have been a change	45
19	have been a matter	43
20	have been a source	38
21	have been a feature	38
22	have been a friend	38
23	have been a breach	37
24	have been a failure	37
25	have been a time	32
26	have been a disaster	32
27	have been a factor	31
28	have been a man	29
29	have been a couple	28
30	have been a part	26