Respuesta:
1. Jack and I were at Ian's party last friday.
2. Jack was on holidays in Mexico last summer
3. Jack was in the library ten minutes ago.
4. Jack was in his bedroom an hour ago.
5. Jack and Emma were at the gym yesterday afternoon.
Explicación:
básicamente, solo pon:
1. were
2. was
3. was
4. was
5. were
después de el/los nombre(s) en cada oración, espero entiendas ｡(*^▽^*)ゞ
