I really don't like how tones are presented as a confounding item like irregular verbs. Tonal languages essentially just take advantage of extra bandwidth that was ignored by most european languages. They are hard for western learners but only because we are unused to treating tonal information as important. In fact because of tones and limited pronunciations available I have found that I feel Chinese is more toleran…
English does use tones: "Going to the store" (rising = question) "Going to the store" (flat or descending = statement)
Stress in English is phonemic however, viz. this minimal pair:
"rekord (record, n.) vs r@"kord (record, v.)
This is a regular phonological process in many English dialects to derive verbs from certain nouns (or is it the other way around?). Future English could turn this into a tonal distinction - I think that has a precedent in Swedish.