Подскажите. Скоро будет тест по английской грамматике. Когда пишем was, а когда were?

1. Our engineers (was, were) at the factory yesterday. 2. When (was, were) you a student? 3. Our children (was, were) not at school yesterday. It (was, were) Sunday. 4. Who (was, were) your English teacher at school? Mr. Sedov (was, were). 5.

1. How many rooms Was|were in the house? 2. Was|were a dining room in the house? 3. was|were a living room? 4. how many bedrooms were|was in the house? 5. were|was any bathrooms there? 6. how many bathrooms was|were in the house? 7.

2. The girls was/were happy last week 3. Grandma was/were at the supermarket two hours ago. 4. you was / were late for school yesterday. 5. Sam was/were tired last night. 6. Marek and Anna was/were bored last Saturday.

Выбрав правильную форму глагола, заверши эти предложения. 1) Mr Robinson and his wife (was, were) at the cinema yesterday night. Treir pets (was, were) at home. 2) My friends and i (was, were) at school yesterday afternoon.

Проверь, хорошо ли ты знаешь древнюю историю. Скажи, были ли эти предметы у древних римлян. 1) Were there pianos then? 2) Were there schools then? 3) Were there ships then? 4) Were there pens and pencils then? 5) Were there books then?