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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: Ear Hear. 2010 Oct;31(5):625–635. doi: 10.1097/AUD.0b013e3181df5cc2

Table 2.

Ages (in months) when two distinct uses of verb tense marking were first observed in the language samples (following Hadley & Short, 2005) and the ages when all four forms were present in the samples (right-most column).

Cop BE
(That is a
cup)		 /3s
(He needs
milk)		 Aux DO
(These
do have
holes)		 AUX BE
(He is
running
away)		 Age at
Tense
Diversity*
S1 38 48 42 38 48
S2 54 78 54 78 78
S3 38 46 42 42 46
S4 41 50 44 50 50
*

Tense diversity = sampling age at which child used at least two examples of each category of verb tense marking.