Which skill would involve writing out sounds in the word "grab"?

The skill that involves writing out sounds in the word "grab" is phoneme segmentation. This process requires breaking down a word into its individual phonemes, or distinct sounds. In the case of "grab," the phonemes can be identified as /g/, /r/, /æ/, and /b/. Segmenting these sounds allows learners to understand how the word is constructed, which is fundamental for developing spelling and reading skills. Learners who can segment phonemes can better manipulate sounds within words, aiding their overall literacy development.

In contrast, phoneme addition involves adding a sound to a word, phoneme substitution entails replacing one sound with another, and phoneme categorization requires identifying which sound is different in a set of words. Each of these skills serves a different purpose in phonemic awareness and contributes to a child's reading ability in unique ways, but they do not specifically relate to breaking down the word "grab" into its individual sounds like segmentation does.