Answer to Question 1
Responses to various parts of the question are as follows:
a. Skinner would take a strict nurture position, saying that language development is entirely the result of environmental events. Chomsky would say that nature provides a language acquisition device that facilitates language learning in human beings but that exposure to a particular language (nurture) is also crucial.
b. In Skinner's view, parents and other people reinforce language-like utterances and become increasingly fussy about what they reinforce, until eventually children produce mature speech. (If your students have background in behaviorist theories of learning, they may use the term shaping in their discussion.) In Chomsky's view, a biologically built-in language acquisition device sensitizes infants to subtle distinctions in spoken language, helps them divide a steady stream of auditory input into small segments (e.g., syllables), identify patterns in what they hear, and impose certain limits (e.g., a Universal Grammar) on the syntactic rules they formulate for their language. The powerfulness (or perhaps the very existence) of this language acquisition device appears to fade over time, as reflected in the fact that children show early sensitive periods in language learning.
c. Chomsky would critique Skinner's position by pointing out that (a) parents tend to reinforce statements that are factually accurate regardless of whether the statements are grammatically correct and (b) children often persist in using some grammatical forms despite others' discouragement. Skinner might argue that the apparent sensitive periods in language development are due to the fact that language behaviors acquired early in life may interfere with learning very different language behaviors later on. (You should give credit for any credible behaviorist refutation of nativism, as a behaviorist critique of nativist views is not presented in the textbook.)
Answer to Question 2
C