SN4 ""

No	Pattern	Freq
1	it [is] sometimes [adj] [verb]	113
2	it [is] sometimes [adj] [verb]	100
3	it [is] sometimes difficult [verb]	24
4	it [is] sometimes difficult [verb]	24
5	it [is] sometimes possible [verb]	21
6	it [is] sometimes possible [verb]	21
7	it [is] sometimes useful [verb]	14
8	it [is] sometimes useful [verb]	14
9	it [is] sometimes hard [verb]	10
10	it [is] sometimes necessary [verb]	10
11	it [is] sometimes [adj -er] [verb]	10
12	it [is] sometimes hard [verb]	10
13	it [is] sometimes necessary [verb]	10
14	it [is] sometimes [adv] [verb]	8
15	it [is] sometimes [adv] [verb]	8
16	it [is] sometimes easy [verb]	7
17	it [is] sometimes good [verb]	6
18	it [is] sometimes easier [verb]	5
19	it [is] sometimes worth [verb]	5
20	it [is] sometimes [prep] [verb]	5
21	it [is] sometimes worth [verb]	5
22	it [is] sometimes [prep] [verb]	5
23	[conj] it [is] sometimes [verb]	48
24	[subord] it [is] sometimes [verb]	41
25	as it [is] sometimes [verb]	24
26	as it [is] sometimes [verb]	24
27	[noun] it [is] sometimes [verb]	13
28	[noun sg] it [is] sometimes [verb]	11
29	[adv] it [is] sometimes [verb]	10
30	[adv] it [is] sometimes [verb]	10