Нужно раскрыть скобки и указать какое это время  1) when did you reaslise that your bicycle (to dissapear)?        2)if she (not to work ) hard she'll fail her final examinations   3)James was sure  that he (to pass) the examin...

HAD DISSAPEARED DOESN'T WORK WOULD PASS LOST WILL ARRIVE HAS BEEN OFFERED

1) when did you reaslise that your bicycle had disappeared? – Past Perfect         2)if she doesn’t work  hard she'll fail her final examinations – Present Simple u Future simple.   3)James was sure  that he had passed the examinations well – Past Perfect     4)I've lost my purse-when did I lose it? – Past Simple     5)the train arrives at two o’clock  - Present Simple 6) Hanna has been offered a new job - Present Perfect Passive.