We need not visit Grandma unless she is worried about us.

If we do not visit Grandma soon, she will start to worry.

We should visit Grandma in case she is worried about us.

Grandma is worried about us, so we should visit her.

made up

took up

summed up

showed up

prohibits

beliefs

looks

problems

evolution

academic

influential

agriculture

show

deed

display

feat

publishing

to publish

published

to be published

survive

wildlife

habitat

campfire

because

although

because of

despite

Nothing can be done to help the wild tuna survive.

Raising juvenile tuna is only one measure to save the wild tuna.

Tuna overfishing has stopped due to repeated warnings.

To recover stocks of tuna, we should be aware of what species of tuna we are eating.

breakdown

break-in

breakthrough

outbreak