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. 2012 Apr 13;4:5. doi: 10.3389/fnevo.2012.00005

Figure 4.

Figure 4

The “crossed-serial” dependency structure of the English auxiliary verb system. Each auxiliary verb, will, have, be, and be, is linked to the suffix of the verb that follows. The zero element associated with will is a so-called “zero morpheme” – the suffix is present, but not pronounced.