en_tn_condensed/act/08/31.md

How can I, unless someone guides me?

This question was asked to state emphatically that he could not understand without help. Alternate translation: "I cannot understand unless someone guides me." (See: rc://en/ta/man/translate/figs-rquestion)

He begged Philip to ... sit with him

It is implied here that Philip agreed to travel down the road with him to explain the scriptures. (See: rc://en/ta/man/translate/figs-explicit)