Unit 8 - Our World (passive modals)

Future cars __________to conserve energy.

• must be designed

• may be design

• can be design

The broken sink __________ to conserve water.

• must be fixed

• can be fix

• may be fix

Green shopping bags ______________ to reduce waste.

• can use

• can be

• can be used

Energy _______________ by turning of the lights.

• can be conserve

• can be conserved

• can conserved

Some chemicals _______________ in special bottles.

• may be store

• may stored

• may be stored

Plastic bottles ______________ in recycling bins.

• may put

• may be

• may be put

Glass ________________

• can recycle

• can be recycled

• can be recycle

Combine the sentences:

We recycle trash. We save energy.

• When recycle trash, we save energy.

• When we recycle trash, we save energy.

• When we save energy, we recycle trash.

Combine the sentences:

We are tired. We go to sleep.

• When we are tired, we go to sleep.

• We go to sleep when we are tired.

• When we are tired, when we go to sleep.

When we turn the lights off...

• we conserve energy

• we save water

• we energy-efficient