Choose the correct verb forms to complete the sentences.

Choose the correct option.

The forest [am|are|was|weren't] very clean and beautiful.

Where [did Alice saw|did Alice seen|seen Alice|did Alice see] that rare T-shirt?

Max [singed|sang|sing|sung] a happy song ten minutes ago.

They [don't play|didn't played|didn't play|not played] football last weekend.