SN4 ""

No	Pattern	Freq
1	[pron] is often	1506
2	[pers pn] [is] often	1153
3	it [is] often	1073
4	it [is] often	1073
5	[Wh det] [is] often	236
6	there [is] often	215
7	there [is] often	215
8	[ex0] [is] often	215
9	which [is] often	166
10	which [is] often	166
11	[pron] 's often	135
12	what [is] often	70
13	what [is] often	70
14	he [is] often	46
15	he [is] often	45
16	she [is] often	24
17	she [is] often	23
18	[pn reflx] [is] often	15
19	one [is] often	13
20	[indef pn] [is] often	13
21	one [is] often	13
22	[Wh pn] [is] often	9
23	who [is] often	9
24	itself [is] often	9
25	who [is] often	9
26	itself [is] often	9
27	they [is] often	8
28	them [is] often	8