Brown (1973) studied children’s language development between the ages of 20 months and 36 months and found the sequence shown below occurred regularly. The features are also listed in the order in which they were acquired:
1) –ing
2) plural ‘-s’
3) possessive ‘-s’
4) the, a
5) past tense –ed
6) third person singular verb ending – s (eg): he sings
7) auxiliary verb ‘be’ (eg): I am dancing
Cruttenden (1979) divided the acquisition of inflections into the following three stages:
1) In the first stage, children memorise words on an individual basis
2) In the second stage they show an awareness of the general rules of inflections. They observe that past tense forms usually end in –ed so instead of ‘ran’ they say ‘runned’. This kind of error is known as Overgeneralisation.
3) In the third stage, correct inflections are used
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