1. Suppose a grammar allows conjoined constructions such as

S -> S and S S-> S while S S-> S or S S -> S so S S -> S but S

Provide 2 separate parse trees in bracketed notation for the following complex sentences:

a) Mary went off the curb while she was riding her tricycle and she closed her eyes.

b) The boy went skiing or riding but I cant remember now and it doesnt matter anyway.

c) He was hurt and the doctor or the nurse said that he might need stitches so it would heal properly.