係咪咁讀呀 ⇒　発音は正しいですか。 発音自体を注目してる感じですね。 言い方を聞きたい時　⇒　請問呢個應該點講吖？

i think u r just confused about the meaning of "係咪", 係咪 is short for 係吾係, when u say 係吾係 very fast, the voice will turn to be simular to 係咪.

係咪咁讀呀 means...is it pronoun like this?

it means does it pronounce like that . この文の 意味は"この はつおん は たたしい ですか". in cantoness "係"means yes,it pronounce like はい in japaness." "咪", pronounce like み "咁",pronounce like がん "讀"pronounce like ど infact, many japanese words pronounce like cantoness words and interprite the same meaning . 私の英語も日本語もよく　なぃ　だから, 以上の説明は分りですか. 私の説明が あなたに対して役に立つことを望みます .

is this word can be spell like that "---- "? 係咪yes or no 咁 like that or in this way 讀 spell or express 呀=?(as a question) my english is not very well. hope that you could understand.