2complete the sentences with the correct form of the verbs brackets. use the present simple and will. 1 if we (fly) less when we travel, it (reduce) pollution. 6 some endangered species (become) extinct if we (not protect) them. 7 we (not be) late if dad (give) us a lift. 8 if our natural resources (run out), humans (not have) enough energy to survive on earth. 9 more people (have) homes if we (build) larger houses.

1. If we fly less when we travel, it will reduce pollution.
6. Some endangered species will become extinct if we don't protect them.
7. We'll not be late if Dad gives us a lift.
8. If our natural resources run out, humans will not have enough energy.
9. More people will have homes if we build larger houses.

If we fly less when we travel, it will reduce pollution.
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Some endangered species will become extinct if we don't protect them.
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We won't be late if Dad gives us a lift.
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If our natural resources run out, humans won't have enough energy
to survive on Earth.
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More people will have homes if we build larger houses.
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Небольшое правило:
Если предложение стоит перед if, unless, when, мы используем Present Simple.