1. He was typing a text the whole day yesterday. - Past Continuous, т.к. процесс и выражение the whole day yesterday2. At this time tomorrow I will be sitting on a bus. - Future Continuous, т.к. процесс и At this time tomorrow3. What has happened to him? I have not seen him for a long time. - Present Perfect (недавно случившееся действие) + Present Perfect Continuous (действие началось в прошлом и продолжается до сих пор+for a long time)4. When I left home, it had already stopped snowing, but a strong wind was still blowing. - Past simple (простое законченное действие) + Past Perfect (действие до главного действия + already) + Past Continuous (процесс+still ).