6. It is ... clock. It is ... old clock. 7. Betty can see ... troll. It is ... old troll.
8. It is ... egg. It is ... bad egg.
9. It is ... ant. It is ... black ant.
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6. It is "an" clock. It is "an" old clock.
Explanation: We use "an" before a word that starts with a vowel sound. In this case, "clock" starts with the consonant sound /kl/, so we use "an" before it. Similarly, "old" starts with the vowel sound /oʊ/, so we use "an" before it.

7. Betty can see "a" troll. It is "an" old troll.
Explanation: Similarly, we use "a" before a word that starts with a consonant sound. In this case, "troll" starts with the consonant sound /tr/, so we use "a" before it. Again, "old" starts with the vowel sound /oʊ/, so we use "an" before it.

8. It is "an" egg. It is "a" bad egg.
Explanation: Following the same rule as before, "egg" starts with the vowel sound /ɛ/ so we use "an" before it. However, "bad" starts with the consonant sound /b/, so we use "a" before it.

9. It is "an" ant. It is "a" black ant.
Explanation: Just like the previous examples, "ant" starts with the vowel sound /æ/, so we use "an" before it. However, "black" starts with the consonant sound /bl/, so we use "a" before it.

In summary, we use "an" before words that start with a vowel sound and "a" before words that start with a consonant sound. This helps to maintain proper grammar and pronunciation in English sentences.