+ положительное, - отрицательно, ? вопросительное.
1. + Our engineers make contracts with a lot of firms.
- Our engineers don't make contracts with a lot of firms.
? Do our engineers make contracts with a lot of firms?
2. + Our director makes contracts with foreign firms.
- Our director doesn't make contracts with foreign firms.
? 1) Does our director make contracts with foreign firms?
? 2) With which firms our director makes contracts? / Which firms our director makes contracts with?
3. + He told a funny story yesterday.
- He didn't tell a funny story yesterday.
? 1) Did he tell a funny story yesterday?
? 2) What did he tell yesterday?
? 3) When did he tell a funny story?
4. + Pete invited me to his party last saturday.
- Pete didn't invite me to his party last saturday.
? Did Pete invite me to his party last saturday?
5. + They are having dinner now.
- They are not having dinner now.
? Are they having dinner now?
