I'm working on a project that explores how imperative mood varies in 'intensity'.
For example, one can 'soften' the tone of a directive by including the speaker in the command:
"Let's go to school" is 'softer' than "Go to school"
Or by starting with the verb 'Try':
"Try working harder" is 'softer' than "Work harder".
Are there any other quantifiable ways of influencing the tone of a directive, either way?