Phonics works reliably with phonically reliable spelling systems - with reliable relationships between sounds and letters. English spelling is not completely phonic: too many sounds have unpredictable spellings for it to be called 'phonic', as u can see below.
(The figures in brackets show how many of the 7,000 most used English words which I have analysed use that spelling - and how many spell it differently.)
-ain: rain – lane, vein, reign, champagne (39 – 19)
-ay: play – they, weigh,ballet,cafe, matinee (35 – 20)
cr/cl: crab/ clot – chrome, chlorine (192 – 10)
-c: lilac –stomach, anorak (89 – 9)
-ck: neck –cheque, rec (62 – 6)
k: kite/ kept – chemistry (124 – 7)
-k: seek –unique (36 – 5)
-sk: risk –disc, mosque (86 – 10)
qu: quick – acquire, choir (78 – 4)
x: fix – accept, except, exhibit (98 – 15)
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e: end– head, any, said, Wednesday, friend, leisure,
leopard, bury (301 – 67)
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er: her – turn, bird, learn, word, journey (70er – 124)
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ee: eat– eel, even, ceiling, field, police,people,
me, key,ski, debris, quay (152ea – 304)
--y: jolly– trolley, movie, corgi (475 – 39)
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f: fish– photo, stuff, rough (580 - 44)
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g: garden– ghastly, guard (171– 28)
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h: house– who (237 – 4)
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i: ink– mystery, pretty, sieve, women, busy, build (421 – 53)
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i-e: bite – might, style, mild, kind, eider, height, climb
island indict sign (278 – 76)
-y: my – high,pie, rye, buy, I, eye (17 – 14)
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j: jam/ jog/ jug (0)
jelly, jig – gentle, ginger (18 – 20)
-ge: gorge (0)
-dg: fidget– digit (29 – 11)
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l: last– llama (1,945 – 1)
20: m: mum– dumb, autumn (1,128 – 19)
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n: nose– knot, gone, gnome, mnemonic (2,312 – 34)
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-ng: ring (0) 22
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o: on– cough, sausage, gone(357 – 5)
want – wont (19 – 1); quarrel– quod (10 -1)
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o-e: mole – bowl, roll, soul; old – mould
boast, most, goes, mauve (171 – 100)
-o: no –toe, dough, sew, cocoa, pharaoh, oh, depot (106 – 59)
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oi: oil– oyster (29 –1)
-oy: toy –buoy (12 – 1)
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oo (long): food– rude, shrewd, move, group, fruit, truth, tomb,
blue, do, shoe,through, manoeuvre (94 – 108)
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oo (short): good– would, put, woman, courier (15 -21)
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or: order– board, court; wart, quart– worn, quorn (188 – 16)
-ore:more – soar, door, four, war, swore,abhor (23– 17)
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ou: out– town (74 – 24);
-ow: now – plough (11 – 4)
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p: pin (0)
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r: rug– rhubarb, write (1,670 – 27)
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s: sun – centre,scene (138 – 49)
-ce: face – case; fancy– fantasy (153 – 65)
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sh: shop – chute, sure, moustache, liquorice (166 – 30)
-tion: ignition– mission, pension, suspicion,fashion (216 – 81)
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t: tap, pet – pterodactyl, two, debt (1,398 – 4)
--te: delicate – democrat (52 – 3)
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th (sharp): this (0)
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th (soft): thing (0)
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u: up– front, some, couple, blood (308 – 68)
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u-e: cute – you,newt, neutral, suit, beauty, Tuesday, nuclear (137 – 21)
-ue: cue –few, view,menu (20– 22)
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v: van (0)
-ve: have –spiv (116– 3) [80 with surplus –e]
-v-: river– chivvy (73 – 7) – v/vv after short vowel
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w: window– which (216 – 31)
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y: yak– use (31 – 11)
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z: zip– xylophone (16 – 1)
-se: rose –froze (85– 33)
wise– size (UK 31 – 3, US 11 – 22)
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zh: -si-/-su-: vision, measure – azure (20 – 3)
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Unstressed, unclear vowel sound (or schwa),
occurring mainly in 8 endings and 2 prefixes:
-able: loveable– credible(33 – 17)
-ccle: bundle (2 consonants + -le for -l) (0)
-al: vertical– novel, anvil, petrol (200+ – 32)
-ary: ordinary– machinery, inventory, century,carpentry(37 – 55)
-en: fasten– abandon, truncheon, orphan, goblin, certain (73 – 132)
-ence: absence– balance (33 – 26)
-ent: absent – pleasant (176 – 58)
-er: father –author, armour, nectar, centre, injure,quota (UK 340, US 346 – 135/129)
butcher – picture (42 –ure)
de-: decide – divide (57 – 29)
in-: indulge – endure (73 – 30)