SN4 ""

No	Pattern	Freq
1	[noun] systems have [be]	41
2	[adj] systems have [be]	38
3	[noun sg] systems have [be]	38
4	[adj] systems have [be]	21
5	[det] systems have [be]	12
6	these systems have [be]	5
7	these systems have [be]	5
8	systems [noun] have [be]	14
9	systems [noun sg] have [be]	11
10	systems [pron] have [be]	7
11	systems that have [be]	5
12	systems [that] have [be]	5
13	systems [vb mod] have [be]	5
14	systems that have [be]	5
15	systems [conj] have [be]	5
16	systems [Wh det] have [be]	5
17	systems which have [be]	5
18	systems which have [be]	5
19	systems [modal v] have [be]	5
20	systems have [adv] [be]	22
21	systems have [adv] [be]	17
22	systems have [prep] [be]	11
23	systems have to [be]	11
24	systems have [prep] [be]	11
25	systems have to [be]	11
26	systems have already [be]	6
27	systems have already [be]	6
28	systems have not [be]	5
29	systems have [not/n't] [be]	5
30	systems have [be] [verb]	73