SN4 ""

No	Pattern	Freq
1	[conj] they have been able	25
2	[subord] they have been able	15
3	[noun] they have been able	10
4	[that] they have been able	8
5	that they have been able	8
6	that they have been able	8
7	if they have been able	7
8	if they have been able	7
9	[noun pl] they have been able	6
10	[pron] they have been able	5
11	they [vb mod] have been able	13
12	they [modal v] have been able	13
13	they would have been able	6
14	they have [adv] been able	51
15	they have not been able	33
16	they have [not/n't] been able	33
17	they have [adv] been able	18
18	they have n't been able	18
19	they have not been able	15
20	they have never been able	5
21	they have never been able	5
22	they have been able [to-vb]	71
23	they have been able [verb]	71