Puwede / Pwede ( the latter is the contemporary spelling) rule:
1. Pwedeng + Inf verb + subject
hal: Pwedeng magluto ang nanay mamaya.
Pwedeng lutuin ng nanay ang pansit mamaya.
2. Pwede + pronoun + lig + Inf Verb
hal: Pwede siyang magluto mamaya.
Pwede niyang lutuin ang pansit mamaya.
3. Pwede + particle + pron + lig + Inf verb
hal: Pwede na siyang magluto mamaya.
Pwede na niyang lutuin ang pansit mamaya.
4. Don't forget the Ko, Mo, Ka pron exception : These 3 pronouns precede particles
Pwede + (ko/ mo/ ka) + particle + lig + Inf Verb
hal: Pwede ka nang magluto mamaya.
Pwede mo nang lutuin ang pansit mamaya.
Remember there is always the general rule in grammar as there are variations of the rule in the spoken language. Knowing the general position of the word in the sentence could give a better appreciation of the variations. Hope this help.