1 Complete the sentences from the text on
page 106. Then read rules 1–3.
The engine\'_too heavy for wooden tracks.
They? very comfortable.
It? _ very successful.
Steam engines 4_ heavy.
RULES
1 We use was / were to talk about the past.
2 Was / were are the past forms of be.
3 We form the negative with was / were +
not.​