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Various explanations have been put forth for the asymmetrical acquisition of tense and aspect morphology across categories of lexical aspect. This experiment tested the adequacy of a subset of such accounts by examining English native speakers’ ( n = 40) use of progressive and past tense morphology within activity and accomplishment verb frames during their early acquisition of a miniature artificial language. Participants completed a lesson in which types and tokens of lexical aspect and past and present morphology were balanced. Although significant effects at p < .05 were found for lexical aspect and morphological marking, the interaction between these factors, expected by the aspect hypothesis, was non-significant. The experiment suggests that the effects of lexical aspect may be absent during the earliest phases of second language acquisition or may be due to factors methodologically excluded in this study such as distributional biases in second language input.

Haznedar (2007) argues that longitudinal data from a child learner of English who has Turkish as a first language (L1) constitute a counterexample to the Aspect Hypothesis. In this commentary, we show that her argument is not warranted because the Aspect Hypothesis does not presuppose that tense is defective, contra her claim. However, Haznedar’s finding that many achievement verbs in past tense context are left uninflected suggests that refinement of the Aspect Hypothesis may be needed.

This review article surveys recent research on the first and second language acquisition of temporal and aspectual properties of natural languages.Three recently published books are discussed in the context of the primacy or aspect hypothesis and the prototype, the connectionist and the discourse explanations for the attested acquisition sequences. A potentially misleading terminological issue is highlighted: Deictic tense, grammatical and lexical aspect are often conflated in acquisition studies. Recent research from the (innatist) generative perspective (e.g., Olsen and Weinberg, 1999) is also examined. An alternative explanation of the skewed acquisition sequences in terms of processing costs is proposed. Some important topics for future aspect research are identified.