There are so many TV series related to crimes (Without a Trace; Criminal Minds; Cold Case; A murder, she wrote; etc.) that in a way, we all feel that solving a mysterios case is not that hard…but, how good are you at speculating in English? Have a look at the summery of modals of deduction and speculation below and then imagine you are a CSI member trying to solve a real life crime case. Good luck!!!!