(Alert sirens) may go_off.Logical formLearned from13 sentences. A radio may go_off air.Logical formLearned from13 sentences. A bomb may go_off on a bus.Logical formLearned from13 sentences. (Flash bulbs) may go_off.Logical formLearned from13 sentences. A mission may go_off without a hitch.Logical formLearned from13 sentences. Blasts may go_off.Logical formLearned from13 sentences. A (suicide bomb) may go_off.Logical formLearned from13 sentences. (Air raid sirens) may go_off.Logical formLearned from13 sentences. A (roadside bomb) may go_off in an afternoon.Logical formLearned from12 sentences. A bomb may go_off in a district.Logical formLearned from12 sentences. A fire may go_off.Logical formLearned from12 sentences. (Cell phones) may go_off.Logical formLearned from12 sentences. An alarm may go_off some times.Logical formLearned from12 sentences. A sound may go_off.Logical formLearned from12 sentences. A person may go_off a rocker.Logical formLearned from12 sentences.