Краткое пояснение: Необходимо выбрать правильную отрицательную форму глагола to be (wasn't или weren't) в прошедшем времени.
- She wasn't at the cafe on Monday. (She - единственное число)
- Alfredo and Sam weren't in the museum on Tuesday after. (Alfredo and Sam - множественное число)
- My cousin wasn't at the cinema yesterday. (My cousin - единственное число)
- Some classmates weren't late last Friday. (Some classmates - множественное число)
- My Friends weren't happy with the results. (My Friends - множественное число)
Ответ: 1. wasn't, 2. weren't, 3. wasn't, 4. weren't, 5. weren't