SN4 ""

No	Pattern	Freq
1	[adj] is before	13
2	[det] is before	12
3	[noun] is before	10
4	[pers pn] is before	9
5	[pron] is before	9
6	this is before	8
7	this is before	8
8	it is before	7
9	it is before	7
10	[noun sg] is before	6
11	is [verb] before	91
12	is [vb pp] before	87
13	is [adj] before	36
14	is [adj] before	33
15	is needed before	19
16	is need before	19
17	is required before	16
18	is require before	16
19	is necessary before	13
20	is necessary before	13
21	is [adv] before	11
22	is that before	9
23	is [that] before	9
24	is [conj] before	9
25	is that before	9
26	is [adv prt] before	6
27	is [adv] before	5
28	is before [pron]	27
29	is before [pers pn]	26
30	is before you	8