SN4 ""

No	Pattern	Freq
1	[noun] be [to-vb] and [adv]	12
2	[noun sg] be [to-vb] and [adv]	11
3	be [adj] [to-vb] and [adv]	94
4	be [adj] [to-vb] and [adv]	79
5	be [verb] [to-vb] and [adv]	44
6	be [vb pp] [to-vb] and [adv]	27
7	be easy [to-vb] and [adv]	19
8	be [v-ing] [to-vb] and [adv]	17
9	be easy [to-vb] and [adv]	13
10	be difficult [to-vb] and [adv]	12
11	be difficult [to-vb] and [adv]	12
12	be [adj -er] [to-vb] and [adv]	11
13	be going [to-vb] and [adv]	8
14	be [adv] [to-vb] and [adv]	8
15	be able [to-vb] and [adv]	8
16	be able [to-vb] and [adv]	8
17	be go [to-vb] and [adv]	8
18	be hard [to-vb] and [adv]	7
19	be likely [to-vb] and [adv]	6
20	be likely [to-vb] and [adv]	6
21	be easier [to-vb] and [adv]	5
22	be [to-vb] [noun] and [adv]	14
23	be [to-vb] [adj] and [adv]	13
24	be [to-vb] [adv] and [adv]	11
25	be [to-vb] [adj] and [adv]	9
26	be [to-vb] [adv] and [adv]	8
27	be [to-vb] [noun sg] and [adv]	8
28	be [to-vb] [noun pl] and [adv]	5
29	be [to-vb] and [verb] [adv]	17
30	be [to-vb] and [vb infin] [adv]	13