SN4 ""

No	Pattern	Freq
1	[pron] [was/were] was a	7
2	[pers pn] [was/were] was a	6
3	[was/were] [verb] was a	92
4	[was/were] [vb pp] was a	67
5	[was/were] [pron] was a	46
6	[was/were] [pers pn] was a	28
7	[was/were] needed was a	27
8	[was/were] need was a	27
9	[was/were] [v-ing] was a	23
10	[was/were] it was a	19
11	[was/were] it was a	19
12	[was/were] there was a	15
13	[was/were] [ex0] was a	15
14	[was/were] there was a	15
15	[was/were] [adj] was a	11
16	[was/were] a was a	10
17	[was/were] a was a	10
18	[was/were] [art] was a	10
19	[was/were] [art] was a	10
20	[was/were] he was a	7
21	[was/were] he was a	7
22	[was/were] require was a	7
23	[was/were] [adv] was a	7
24	[was/were] required was a	7
25	[was/were] [noun] was a	7
26	[was/were] left was a	6
27	[was/were] [adj] was a	6
28	[was/were] leave was a	6
29	[was/were] that was a	5
30	[was/were] [det] was a	5