While I was teaching today I found the following sentence:

The steady stream of fossils discovered during the late 60s dazzled the scientific world.

I asked my students to ask a question to which "the steady stream of fossils" would be the
answer.

They asked the following questions which are grammatically incorrect.

1 - What was dazzled the scientific world?
2 - what made the scientific world to be dazzled?
3 - What did dazzle the scientific world?

What i want is ideas to teach them how to explain why these were wrong.
I don't want to teach them about grammar terms like 'object, subject, or passive voice. Not at this stage.

Can any one give me ideas how i can explain to them why these above sentences were incorrect?