Ответ:

1. Neither will I.

2. So can I.

3. Neither have I.

4. So did I.

Ответ:

1. He won't watch to the weather forecast. Neither will I

2. He can admire the valley. So can I

3. He hasn't got very nice scenery fron thr window. Neither have I

4. He saved the money to buy a car. So did I

В отрицательных предложениях используем Neither, в положительных - So