The detailed answer provides examples of using 'ago' in different contexts to express past time periods.
How long ago did you wake up? I woke up an hour ago.
When did this lesson begin? The lesson began 30 minutes ago.
How long ago did you have a school holiday? I had a school holiday a month ago.
How long ago did you get sick? I got sick two days ago.
How many hours ago did the headmaster speak to you? The headmaster spoke to me three hours ago.
When did you ride in a bus? I rode in a bus yesterday.
When did you do your homework? I did my homework last night.
How long ago did you have something to eat? I had something to eat five hours ago.
How many weeks ago did you have your hair cut? I had my hair cut two weeks ago.
When did it rain? It rained this morning.
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