Having+past participle

[boy 1980]

Hello!

We saw in school last week how having+past participle works but I didn't understand and we have a test on monday. :-(
For example, if I say:
Having passed the first step, you can't go back.
Does it work???

Thank you in advance!

 

[Raymott]

Yes, it does work. That's how you use it.
Having understood that, you should do OK in the test.