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.

sweetheart

/ˈswiːtˌhɑːt/ noun

Forms sweethearts

noun A person who is always very kind. “She is such a sweetheart: she never complains about me being late.”
noun A person very much liked or loved by someone, especially when both partners are young. “John married his high-school sweetheart in 1981.”
noun A term of endearment, especially for a lover or child.
noun (US) A female member of a college or university fraternity.

Synonyms

From Middle English swete heorte, swete hert (term of endearment); equivalent to sweet + heart.

Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “sweetheart”, CC BY-SA 4.0. Details