SN4 ""

No	Pattern	Freq
1	[conj] it [be] whether	6
2	it [be] [adj] whether	376
3	it [be] [adj] whether	376
4	it [be] doubtful whether	164
5	it [be] doubtful whether	164
6	it [be] unclear whether	67
7	it [be] unclear whether	67
8	it [be] uncertain whether	37
9	it [be] uncertain whether	37
10	it [be] questionable whether	34
11	it [be] questionable whether	34
12	it [be] debatable whether	31
13	it [be] debatable whether	31
14	it [be] [verb] whether	27
15	it [be] [vb pp] whether	17
16	it [be] [adv] whether	13
17	it [be] immaterial whether	10
18	it [be] immaterial whether	10
19	it [be] [not/n't] whether	9
20	it [be] not whether	9
21	it [be] not whether	8
22	it [be] irrelevant whether	7
23	it [be] irrelevant whether	7
24	it [be] unknown whether	6
25	it [be] unknown whether	6
26	it [be] see whether	5
27	it [be] arguable whether	5
28	it [be] arguable whether	5
29	it [be] [v-ing] whether	5
30	it [be] whether [pron]	24