4. Ask Ss to combine the sentences or rewrite them to make conditional sentences. Tell them that they have to read the sentences carefully before deciding whether to use type 0 or type 1.
Key
1. If the baby is crying, he may be hungry. / The baby may be hungry if he is crying. (type 1)
2. If you travel on a budget flight, you have to pay for your drinks and food. / You have to pay … if you travel … (type 0)
3. If the weather is fine, I walk to work instead of driving. / I walk … if the weather is fine. (type 0)
4. If people start using more solar energy, there will be less pollution. / There will be … if people start using ... (type 1)
5. If they have no homework, they usually play soccer. / They usually play … if they have … (type 0)
6. If you travel by train, it takes five hours to get to Nha Trang. / It takes … if you travel … (type 0)
7. If the government reduces / manages to reduce the use of fossil fuels, our city will become a more liveable place. / Our city will become … if the government reduces / manages to reduce ... (type 1)