Consider the following premises. For all x_10, x_10 is not happy. For all x_12, x_12 will make tea if and only if x_12 is an office clerk. If Jennifer were an office clerk, then Thomas is happy. Can we infer the following from them? Jennifer is making tea.
 From the fact that for all x_12, x_12 will make tea if and only if x_12 is an office clerk we can infer that Jennifer is making tea if and only if Jennifer is an office clerk. From the fact that for all x_10, x_10 is not happy we can infer that Thomas is not happy. From the fact that if Jennifer were an office clerk, then Thomas is happy, and that Thomas is not happy we can infer that Jennifer is not an office clerk. Finally, from the fact that Jennifer is making tea if and only if Jennifer is an office clerk, and that Jennifer is not an office clerk we can infer that Jennifer is not making tea, which contradicts that Jennifer is making tea. Therefore, the answer is no.