Encoding Meaning

lexicogrammar	realises	semantics
Token	Process	Value
Identifier		Identified

the identity encodes the meaning by reference to the wording

Feeling Pain Vs Feeling Hurt

David	felt ('sensed')	pain
Senser	Process: mental perception	Phenomenon

Lise	felt ('was')	hurt
Carrier	Process: attributive intensive	Attribute

Quality As Depictive Attribute Vs Manner Circumstance

Do not go	gentle	into that good night
Process	Attribute: depictive	Location

Cf:

Do not go	gently	into that good night
Process	Manner: quality	Location

Watching, Meditating, Contemplating

Halliday & Matthiessen (2004: 251-2):

The verb watch is anomalous: in I’m watching you, the tense suggests a behavioural process but the you appears as a participant, like the Phenomenon of a ‘mental’ clause.  Since this is restricted to watch, we can label this participant as Phenomenon, indicating the ‘mental’ analogue.

The philosopher	is watching	The Meaning Of Life
Behaver	Process: behavioural	Phenomenon

The philosopher	is meditating	on the meaning of life
Behaver	Process: behavioural	Matter

but:

The philosopher	is contemplating	the meaning of life
Senser	Process: mental	Phenomenon

Halliday & Matthiessen (2004: 450-1):

… mental clauses representing an ‘undecided’ state of mind are used to project indirect questions.  These include clauses of wondering and doubting, finding out and checking, and contemplating, which tend to be characterised by special lexical verbs such as wonder, ascertain …