Further constraints on the null Comp _C

There are additional constraints on where the null Comp _C can occur. The null Comp is not permitted in cases of subject extraction unless there is an intervening clause or or the relative clause is a reduced relative (mode = ppart/ger). This can be seen in ((243)-(246)).

(242)0(242

(243)

*the toy [_i [_C [ _i likes Dafna]]]  (243)0(243

(244)

the toy [_i [_C Fred thinks [ _i likes Dafna]]]  (244)0(244

(245)

the boy [_i [_C [ _i eating the guava]]]  (245)0(245

(246)

the guava [_i [_C [ _i eaten by the boy]]] 

To model this paradigm, the feature rel-pron is used in conjunction with the following equations:

• S_r.t:rel-pron Comp.t:rel-pron
• S_r.b:rel-pron S_r.b:mode
• Comp.b:rel-pronppart/ger/adj-clause (for _C)

The full set of the equations shown above is only present in Comp substitution trees involving subject extraction. So ((247)) will not be ruled out.

(246)0(246

(247)

the toy [_i [_C [ Dafna likes _i ]]] 

The feature mismatch induced by the above equations is not remedied by adjunction of just any S-adjunct because all other S-adjuncts are transparent to the rel-pron feature because of the following equation:
S_m.b:rel-pron S_f.t:rel-pron