1 Complete the sentences with the correct form of the verbs. Look at the text on page 36 and check your answers. Then choose the right answers to make the rules.
1.If nothing is done, they___(be) lost forever.
2.But this ____(happen) unless everyone helps.
3. If they can keep their promises, these beautiful animals____ (disappear).
RULE: We use the first conditional to talk about the consequences of a possible / impossible future action. Condition clause: if + present simple The condition clause can come before or after the result clause. Unless means 2only if / if not. • Result clause: will / won't + main verb​