Stages of forming negative sentences (see examples on pp. 77-78):
- stage 1 – using ‘no’ before the verb or noun
- stage 2 – using ‘don’t’
- stage 3 – using ‘are’, ‘is’, and ‘can’ with ‘not’
- stage 4 – using auxiliary verbs with ‘not’ that agree with tense, person, and number