• The following sections of A Comprehensive Grammar of The English Language (Randolph Quirk, Sidney Greenbaum, Geoffrey Leech, Jan Svartik, Longman, London & New York, 1985) were consulted in preparing this entry:
Major verb classes
§3.1, 96
Verb forms and the verb phrase
§3.2, 96-8
Verbs in auxiliary function
§3.21
The primary verbs
§3.31, 129
Semi-auxiliaries
§3.47 & 3.48, 143-6
Catenative verb constructions
§3.49, 146-7
Situation types
Figure 4.27, 201
Marginal modals
§3.41, 138
The modal auxiliaries
§3.39, 135-6