As discussed in Section 2, the main syntactic constraint on bound-variable pronouns is that they be c-commanded by their antecedents. The domain of the accessibility constraint overlaps with that of the c-command constraint, but it is wider. For one thing, sentence boundaries don’t affect accessibility. For another, within the confines of a sentence, the semantic correlate of an expression E1 may be accessible to that of E2, even if E1 doesn’t c-command E2.  To illustrate this point, consider the conditional donkey sentence in [1a] and its sentence DRS in [1b]: