Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

on fire

prepositional phrase

prepositional phrase Being burned by fire. “If the wind picks up and the flames spread, the whole town could go on fire.”
prepositional phrase (idiomatic) Overwhelmed with emotion; beside oneself.
prepositional phrase (idiomatic) Excited, enthusiastic or passionate.
prepositional phrase (idiomatic) Doing very well; achieving good results at a rapid rate. “That striker has scored four goals so far – he's on fire!”
prepositional phrase (idiomatic, informal) Sexually aroused.
prepositional phrase (hyperbolic, of a body part) Experiencing a burning-like sensation, especially "the burn" (from buildup of lactic acid)

Synonyms

From Middle English on fier, on fijre, on fire, on fyire, on fyre.

Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “on fire”, CC BY-SA 4.0. Details