The Acquisition of Tense in English: Distinguishing child second language from first language and specific language impairment

. Author manuscript; available in PMC: 2008 Oct 9.

Published in final edited form as: Appl Psycholinguist. 2008;29(4):689–722. doi: 10.1017/S0142716408080296

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a. Brendan walks to school every day.	3^rd person singular habitual: 3S[-s]
b. Brendan played soccer yesterday.	simple past, regular verb: PAST[-ed]
c. Brigitte is energetic.	3^rd person singular copula: BE-COP
d. Brigitte and Mira are energetic.	3^rd person plural copula
e. Brendan is playing soccer.	3^rd person singular auxiliary: BE-AUX
f. Brendan and Alex are playing soccer.	3^rd person plural auxiliary
g. I am energetic.	1^st person singular copula
h. I am playing soccer.	1^st person singular auxiliary