Need to find the predicate Adjective.

1. The valley in Johstown Pennsylvania was very deep. PA=deep
2. The hills around Johstown were high. PA=high
3. The lake above Johnstown seemed unusally full. PA=full
4. The concrete dam appeared weak. PA= weak
5. That day May 31, 1889 was stormy. PA=stormy
6. The levels of the lake became dangerously high. PA=dangerously
7. Water rose almost to the top of the dam. PA=none
8. The situation quickly became critical. PA=critical
9. Efforts to warn people were too late. PA=late
10. When the dam broke, it sounded explosive. PA=none
11. The flood water were unstoppable. PA=unstoppable
12. The flood destroyed everything in its path. PA=none
13. The devastation of Johnstown was incredibly rapid. PA=incredibly
14. Once people heard of the disater, they wre generous to the victimw. PA=generous
15. The process of rebuilding Johnstown was slow. PA=slow

6. "dangerously" is an adverb.

10. This sentence has a PA.

13. You found an adverb, not a PA

The rest are correct! :-)

To find the predicate adjective in each sentence, you need to identify the adjective that describes the subject or object of the sentence. Here's how you can do that:

1. Sentence: "The valley in Johnstown Pennsylvania was very deep."
Predicate Adjective: deep (describing the valley)

2. Sentence: "The hills around Johnstown were high."
Predicate Adjective: high (describing the hills)

3. Sentence: "The lake above Johnstown seemed unusually full."
Predicate Adjective: full (describing the lake)

4. Sentence: "The concrete dam appeared weak."
Predicate Adjective: weak (describing the dam)

5. Sentence: "That day, May 31, 1889, was stormy."
Predicate Adjective: stormy (describing the day)

6. Sentence: "The levels of the lake became dangerously high."
Predicate Adjective: dangerously (describing the levels)

7. Sentence: "Water rose almost to the top of the dam."
Predicate Adjective: none (no adjective describing the subject or object)

8. Sentence: "The situation quickly became critical."
Predicate Adjective: critical (describing the situation)

9. Sentence: "Efforts to warn people were too late."
Predicate Adjective: late (describing the efforts)

10. Sentence: "When the dam broke, it sounded explosive."
Predicate Adjective: none (no adjective describing the subject or object)

11. Sentence: "The flood waters were unstoppable."
Predicate Adjective: unstoppable (describing the flood waters)

12. Sentence: "The flood destroyed everything in its path."
Predicate Adjective: none (no adjective describing the subject or object)

13. Sentence: "The devastation of Johnstown was incredibly rapid."
Predicate Adjective: incredibly (describing the devastation)

14. Sentence: "Once people heard of the disaster, they were generous to the victims."
Predicate Adjective: generous (describing the people)

15. Sentence: "The process of rebuilding Johnstown was slow."
Predicate Adjective: slow (describing the process)

Note: If a sentence does not have a predicate adjective, it means that there is no adjective describing the subject or object in that particular sentence.