I-Node, Subordinate clauses

 - how do verbs acquire their inflectional endings?
 - apart from a NP and a VP, clauses also contain an I-node which accomodates tense and agreement features
 - Finite clause : [+Tense][+-Prsent][+-Agr]
 - Nonfinite clause : [-Tense][+-Agr]
 - if a clause contains a modal verb or the infinitival marker 'to', these elements are positioned under 'I' (cannot co-occur)

Sentential Adverb
e.g. however, frankly, perhaps, probably, etc.
 - immediately dominated by S in a tree diagram

Subordinate clauses
1 functioning as DO, S, and Adjunct
e.g. I will repair it when I return

2 functioning as Complements within Phrases
e.g. [PP about what you said to me]
 - because the clauses are Complements, they are represented as sisters of their Heads

3 functioning as Adjuncts within NP
e.g. the watch which was stolen
 - restrictive relative clause
 - nonrestrictive relative clause