I'm sat here with the spelling chart looking for "a" as "o" sound
Ingles,
Even if u have that on a chart, it will only help with learning to read and not all words (was, want, wash - wag, swam, swag).
Reading is largely a matter of recognition, and knowing the main possible sounds for a grapheme like ou (touch, group, mould...) can help a little with getting to the words, especially as context always helps too, and the spellings for consonants are fairly stable. It's mainly the vowels that are tricky. So it's only parts of words which are troublesome.
For spelling, charts are of much less use, especially for the vowels.
The spelling of the /ou/ sound does not have many exceptions and is therefore not too bad
(Crowd, powder. Coward.
Brown, clown, crown, down, drown, frown, gown, town.
Fowl, growl, howl, owl, prowl, scowl, towel.
Flower, power, shower, tower.
Browse, drowse. Bough, plough.)
- Although ow is tricky to read (blown down).
The spellings with lots of alternatives in lots of words, such as the long /oo/ with in 93 words, two or more spellings in 8 (e.g. to, too, two) and several others in 85 (blue shoe flew through...) take the longest to learn.
Because the spelling of long /oo/ is so variable, children have to learn how to spell it in each of the 186 words with that sound one by one.
They learn them a few at a time, grouped in various ways, but in the end it comes down to having to learn how to spell that sound in each of them.
(U can see them all on my websigte and blog.)
The spellings for /oo/ are among the trickiest, but /ee/ is worse (seek, bleak, even, believe...see, me, ski...) and several others are pretty horrid too (stole coal bowl...; late, straight, eight), with consonant doubling the most random of all (rabbit habit, copy poppy, muddy study....).
Masha Bell