SN4 ""

No	Pattern	Freq
1	but [pron] [modal v] have been [adj]	83
2	but [pers pn] [modal v] have been [adj]	64
3	but it [modal v] have been [adj]	46
4	but it [modal v] have been [adj]	46
5	but there [modal v] have been [adj]	14
6	but [ex0] [modal v] have been [adj]	14
7	but [adj] [modal v] have been [adj]	14
8	but [det] [modal v] have been [adj]	14
9	but there [modal v] have been [adj]	14
10	but that [modal v] have been [adj]	10
11	but that [modal v] have been [adj]	10
12	but he [modal v] have been [adj]	7
13	but he [modal v] have been [adj]	7
14	but [noun] [modal v] have been [adj]	5
15	but [modal v] have been [adj] [prep]	8
16	but [modal v] have been [adj] [prep]	8