Sentential Conjunction

The tree for sentential conjunction, shown in Figure 21.4, is based on the same analysis as the conjunctions in the previous two sections, with a slight difference in features. The <mode> feature^21.2 is used to constrain the two sentences being conjoined to have the same mode so that the day is dark and the phone never rang is acceptable, but $\ast$the day dark and the phone never rang is not. Similarly, the two sentences must agree in their <wh>, <comp> and <extracted> features. Co-indexation of the <comp> feature ensures that either both conjuncts have the same complementizer, or there is a single complementizer adjoined to the complete conjoined S. The <assign-comp> feature^21.3 feature is used to allow conjunction of infinitival sentences, such as to read and to sleep is a good life.

  

Figure: Tree for sentential conjunction: $\beta$s1CONJs2