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.

keep up

verb

Forms keeps up keeping up kept up

verb (transitive) To maintain; to preserve; to prevent from deteriorating or falling.
verb (transitive, idiomatic) To continue with (work, etc). “Keep up the good work, team!”
verb (intransitive, idiomatic) To maintain position; to prevent oneself from falling behind; to stay even or ahead of another while walking, driving, etc. “They ran so fast I could hardly keep up.”
verb To ensure that one remains well-informed about something. “I always try to keep up with (or "keep up on") current affairs.”
verb To prevent someone from going to bed or to sleep “The crying baby kept me up all night”
verb (obsolete, printing) To use capital letters as much as reasonable.

Synonyms

From Middle English kepen up (“to perpetuate, maintain, preserve”), equivalent to keep + up.

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