SN4 ""

No	Pattern	Freq
31	[noun] it is necessary for	14
32	[noun] it is [verb] for	13
33	[noun] it is important for	12
34	[noun] it is important for	12
35	[noun] it is essential for	10
36	[noun] it is essential for	10
37	[noun] it is easy for	8
38	[noun] it is difficult for	8
39	[noun] it is difficult for	8
40	[noun] it is [vb pp] for	8
41	[noun] it is [adv] for	8
42	[noun] it is impossible for	7
43	[noun] it is impossible for	7
44	[noun] it is usual for	6
45	[noun] it is usual for	6
46	[noun] it is [v-ing] for	5
47	[noun] it is [adj -er] for	5
48	[noun] it is [adv] for	5
49	[noun] it is rare for	5
50	[noun] it is rare for	5
51	[noun] it is for [art]	11
52	[noun] it is for [art]	11
53	[noun] it is for the	10
54	[noun] it is for the	10
55	[noun] it is for [noun]	8
56	[noun] it is for [pron]	7
57	[noun] it is for [noun sg]	6