SN4 ""

No	Pattern	Freq
1	difficult [to-vb] [adv] the [noun sg]	77
2	difficult [to-vb] [Wh adv] the [noun]	56
3	difficult [to-vb] how the [noun]	37
4	difficult [to-vb] how the [noun]	37
5	difficult to see [adv] the [noun]	31
6	difficult [to-vb] [adv prt] the [noun]	25
7	difficult [to-vb] [adv] the [noun pl]	21
8	difficult [to-vb] [adv] the [noun]	19
9	difficult [to-vb] out the [noun]	11
10	difficult [to-vb] out the [noun]	11
11	difficult [to-vb] up the [noun]	10
12	difficult [to-vb] why the [noun]	10
13	difficult [to-vb] up the [noun]	10
14	difficult [to-vb] why the [noun]	10
15	difficult to understand [adv] the [noun]	9
16	difficult [to-vb] where the [noun]	6
17	difficult [to-vb] where the [noun]	6
18	difficult [to-vb] precisely the [noun]	6
19	difficult [to-vb] precisely the [noun]	6
20	difficult to explain [adv] the [noun]	5