SN4 ""

No	Pattern	Freq
1	but it [be] [adj] for	117
2	but it [be] [adj] for	110
3	but it [be] [adv] for	52
4	but it [be] not for	32
5	but it [be] [not/n't] for	32
6	but it [be] not for	24
7	but it [be] [adv] for	20
8	but it [be] [verb] for	16
9	but it [be] important for	15
10	but it [be] important for	15
11	but it [be] [vb pp] for	10
12	but it [be] only for	10
13	but it [be] only for	10
14	but it [be] [noun] for	10
15	but it [be] n't for	8
16	but it [be] [noun sg] for	8
17	but it [be] essential for	6
18	but it [be] rare for	6
19	but it [be] rare for	6
20	but it [be] [v-ing] for	6
21	but it [be] essential for	6
22	but it [be] easy for	5
23	but it [be] impossible for	5
24	but it [be] hard for	5
25	but it [be] [adj -er] for	5
26	but it [be] difficult for	5
27	but it [be] impossible for	5
28	but it [be] hard for	5
29	but it [be] possible for	5
30	but it [be] possible for	5