How would you say 'by accident', 'accidently' and 'on purpose'?

by accident (accidentally) → pa aza, pa chans, pa aksidan, pa erè, aksidantèlman
on purpose (purposefully) → eksprè, espre, pa espre

1. Mwen rankontre misye pa aza.
    I met the guy by chance.

2. Anpil gran dekouvèt nan monn nan te fèt pa aksidan.
    Many great discoveries in the world were made by accident.

3. Li fè eksprè.
    He did it on purpose.

4. Li pile m pa espre.
    or
    Li fè espre li pile m.
    He stepped on me on purpose.

5.  Se te yon aksidan.  Se pa't fòt mwen.  Mwen pa't fè espre.
     It was an accident.   It wasn't my fault.  I did not do it on purpose.

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