SN4 ""

No	Pattern	Freq
1	[noun] is [adv] [vb pp] in	1623
2	[noun sg] is [adv] [vb pp] in	1242
3	[pron] is [adv] [vb pp] in	552
4	[pers pn] is [adv] [vb pp] in	323
5	it is [adv] [vb pp] in	277
6	it is [adv] [vb pp] in	277
7	[noun pl] is [adv] [vb pp] in	252
8	[Wh det] is [adv] [vb pp] in	203
9	[conj] is [adv] [vb pp] in	197
10	which is [adv] [vb pp] in	185
11	which is [adv] [vb pp] in	185
12	[adj] is [adv] [vb pp] in	161
13	[coord] is [adv] [vb pp] in	131
14	[det] is [adv] [vb pp] in	124
15	field is [adv] [vb pp] in	123
16	fields is [adv] [vb pp] in	123
17	and is [adv] [vb pp] in	113
18	and is [adv] [vb pp] in	113
19	this is [adv] [vb pp] in	102
20	this is [adv] [vb pp] in	102
21	[noun prp] is [adv] [vb pp] in	101
22	that is [adv] [vb pp] in	45
23	[that] is [adv] [vb pp] in	45
24	that is [adv] [vb pp] in	45
25	system is [adv] [vb pp] in	40
26	system is [adv] [vb pp] in	39
27	[verb] is [adv] [vb pp] in	29
28	he is [adv] [vb pp] in	27
29	he is [adv] [vb pp] in	27
30	[subord] is [adv] [vb pp] in	21