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Чтобы сделать высказывания отрицательными, используем вспомогательный глагол "wasn't" или "weren't" в зависимости от подлежащего. Давайте разберем каждое предложение:

1. Ben was busy yesterday.

   Отрицательное: Ben wasn't busy yesterday.

2. Kate’s grandad was in that shop.

   Отрицательное: Kate’s grandad wasn't in that shop.

3. There was a lamp on the table.

   Отрицательное: There wasn't a lamp on the table.

4. Bill and Tim were noisy yesterday.

   Отрицательное: Bill and Tim weren't noisy yesterday.

Для отрицательных предложений мы добавляем "not" после глаголов "was" или "were", образуя "wasn't" или "weren't".