Which spelling pattern has a student mastered if they spelled: chat, hush, thick, shed, and with?

The spelling pattern that the student has mastered, indicated by the words "chat," "hush," "thick," "shed," and "with," aligns with consonant digraphs. Consonant digraphs are pairs of consonants that together make one sound, which can be identified in the provided words. For example, in "chat," the 'ch' functions as a single sound, in "hush," the 'sh' does the same, and in "thick," 'th' makes a distinct sound. Each of these words demonstrates the use of consonant digraphs effectively, showcasing the student's understanding of how two letters can create a single phonetic element in spelling.

In contrast, the other spelling patterns listed do not encompass the examples given. Closed syllables refer to syllables that end in a consonant, while vowel teams involve combinations of vowels that create a specific sound when together. Open syllables, on the other hand, end with a vowel that is typically long, which is not present in the provided examples. Thus, the mastery of consonant digraphs is evident through the student’s spelling of these words.