Use of Conditional Conjunction

You can’t survive in space _________ you have special breathing equipment.

• unless

• as long as

• only if

• since

I wouldn’t mind going to Mars _____________ I could still communicate with my family.

• since

• as long as

• in case

• just in case

We need to explore other planets __________ we are quickly using all the resources on our own.

• since

• as long as

• provided that

• unless

Our space programme won’t be successful __________ the government puts more

money into it.

• just in case

• since

• provided that

• unless

We need an engineer __________ we have problems with our equipment.

• in case

• unless

We should make plans __________ we discover an asteroid heading towards us.

• provided that

• in case

• as long as

• unless

It would be possible to live on Mars _________ we could grow enough food.

• unless

• in case

• provided that

• since

______________ Mars is so far away, it would take weeks to get there.

• Unless

• As long as

• Provided that

• Since

Humankind probably won’t survive the next five hundred years _______ we start living on other planets.

• unless

• provided that

• as long as

• in case

_________ we have the funding, I think we should continue with space exploration

• Unless

• Just in case

• As long as

• In case