This worksheet helps students master the difference between 'was' for singular subjects and 'were' for plural subjects through practical sentence exercises.

Problem Overview:

The task involves choosing the correct form of the verb "was" or "were" to complete each sentence. The key distinction is:
- Was is used with singular subjects.
- Were is used with plural subjects.

Solution and Explanation:

Let's analyze each sentence step by step:

---

#### 1. Tony was / were late, as usual.
- Subject: Tony (singular)
- Correct Form: Was
- Reason: "Tony" is a singular noun.
- Completed Sentence: Tony was late, as usual.

---

#### 2. All the students was / were rowdy today.
- Subject: All the students (plural)
- Correct Form: Were
- Reason: "All the students" refers to multiple individuals, making it plural.
- Completed Sentence: All the students were rowdy today.

---

#### 3. I was / were unprepared for that test.
- Subject: I (singular)
- Correct Form: Was
- Reason: "I" is always singular in English.
- Completed Sentence: I was unprepared for that test.

---

#### 4. My parents was / were not pleased with what I did.
- Subject: My parents (plural)
- Correct Form: Were
- Reason: "Parents" is a plural noun because it refers to two people.
- Completed Sentence: My parents were not pleased with what I did.

---

#### 5. We was / were disqualified from entering the contest.
- Subject: We (plural)
- Correct Form: Were
- Reason: "We" is a plural pronoun.
- Completed Sentence: We were disqualified from entering the contest.

---

#### 6. Paul and Evan was / were amazing out there today.
- Subject: Paul and Evan (plural)
- Correct Form: Were
- Reason: "Paul and Evan" refers to two individuals, making it plural.
- Completed Sentence: Paul and Evan were amazing out there today.

---

#### 7. Our customers was / were very happy with their service.
- Subject: Our customers (plural)
- Correct Form: Were
- Reason: "Customers" is a plural noun.
- Completed Sentence: Our customers were very happy with their service.

---

#### 8. I thought these boots was / were bigger.
- Subject: These boots (plural)
- Correct Form: Were
- Reason: "Boots" is a plural noun.
- Completed Sentence: I thought these boots were bigger.

---

#### 9. Alice was / were very grumpy today.
- Subject: Alice (singular)
- Correct Form: Was
- Reason: "Alice" is a singular noun.
- Completed Sentence: Alice was very grumpy today.

---

#### 10. My neighbors was / were away all weekend.
- Subject: My neighbors (plural)
- Correct Form: Were
- Reason: "Neighbors" is a plural noun.
- Completed Sentence: My neighbors were away all weekend.

---

Final Answer:

1. Tony was late, as usual.
2. All the students were rowdy today.
3. I was unprepared for that test.
4. My parents were not pleased with what I did.
5. We were disqualified from entering the contest.
6. Paul and Evan were amazing out there today.
7. Our customers were very happy with their service.
8. I thought these boots were bigger.
9. Alice was very grumpy today.
10. My neighbors were away all weekend.

Boxed Final Answer:
\[
\boxed{
\text{1. was, 2. were, 3. was, 4. were, 5. were, 6. were, 7. were, 8. were, 9. was, 10. were}
}
\]