SN4 ""

No	Pattern	Freq
1	it is [adv] [adv] established	12
2	it is [adv] [adv] established	12
3	it is [adv] well established	5
4	it is [adv] well established	5
5	[conj] it is [adv] established	18
6	[subord] it is [adv] established	10
7	[coord] it is [adv] established	5
8	it is [adv] [adv] established	14
9	it is [adv] [adv] established	12
10	it is now [adv] established	10
11	it is now [adv] established	10
12	it is [adv] established [conj]	39
13	it is [adv] established that	36
14	it is [adv] established [that]	36
15	it is [adv] established that	36
16	it is [adv] established [prep]	11
17	it is [adv] established [prep]	11
18	it is [adv] established [det]	5
19	it is [adv] established [adj]	5
20	it is [adv] established that	5
21	it is [adv] established that	5