Share Ability with Can and Could
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In the past, many roads ____ last very long.
couldn't
can't
In the twentieth century, heavy traffic and bad weather ___ damage roads.
can
could
However, now scientists ___ make new, long-lasting roads.
could
can
These new roads ___ last a long time without repairs.
can
could
In the past, engineers ___ make roads that were environmentally friendly.
couldn't
can't
Now we have roads that ___ protect the environment.
could
can
For example, a new road in Italy ___ “eat” pollution and clean the air.
could
can
In the United States, we ___ build new roads that collect heat from sunshine. The heat keeps buildings warm.
can
could
We ___ also build new roads out of recycled materials.
could
can
About 100 years ago, drivers ___ imagine these changes were possible.
can't
couldn't
