generate -> generating

book.tex

@@ -4810,7 +4810,7 @@ appropriate stack locations, as discussed in
 Section~\ref{sec:fun-x86}. You might want to introduce a new kind of
 AST node for stack arguments, \code{(stack-arg $i$)} where $i$ is the
 index of this argument with respect to the other stack arguments. As
-you're generate this code for parameter passing, take note of how many
+you're generating this code for parameter passing, take note of how many
 stack arguments are needed for purposes of computing the
 \itm{maxStack} discussed above.