后元音是5个还是6个

5个
1) [e] [] bed bad; men, man; pen, pan; lend land
2) [i:] [ei] real rail; greet, great; mean, main; read raid
3) [e] [AI] bet bite; red write; said side, head, hide
4) [au] [ ] house horse; loud lord; south sauce; now nor; count corn; cloud clause
5) [au] [ ] found fond; gown gone; down don

5个