SN4 ""

No	Pattern	Freq
1	[pron] [is] often [art]	317
2	[noun] [is] often [art]	256
3	[noun sg] [is] often [art]	215
4	[pers pn] [is] often [art]	152
5	it [is] often [art]	145
6	it [is] often [art]	145
7	there [is] often [art]	139
8	[ex0] [is] often [art]	139
9	there [is] often [art]	139
10	[adj] [is] often [art]	63
11	[conj] [is] often [art]	62
12	[det] [is] often [art]	60
13	[subord] [is] often [art]	55
14	as [is] often [art]	53
15	as [is] often [art]	53
16	this [is] often [art]	45
17	this [is] often [art]	45
18	[noun pl] [is] often [art]	33
19	[Wh det] [is] often [art]	22
20	which [is] often [art]	15
21	which [is] often [art]	15
22	that [is] often [art]	12
23	that [is] often [art]	12
24	[adv] [is] often [art]	8
25	[verb] [is] often [art]	7
26	result [is] often [art]	7
27	what [is] often [art]	7
28	what [is] often [art]	7
29	result [is] often [art]	7
30	[adv] [is] often [art]	6