Whether vs If

"Has the email arrived yet?"

Do you know ....

WHICH ANSWER IS WRONG?

• if the email has arrived yet?

• if the email has arrived yet or not?

• if or not the email has arrived yet?

"Will the project be finished soon?"

I don't know ....

WHICH ANSWER IS WRONG?

• whether or not the project will be finished soon

• whether the project will be finished soon

• whether the project or not will be finished soon

• whether the project will be finished soon or not

“Does intelligent life exist on other planets?”

.... is a hotly debated topic among scientists.

WHICH ANSWER IS WRONG?

• If intelligent life exists on other planets

• Whether intelligent life exists on other planets

• Whether or not intelligent life exists on other planets

• Whether intelligent life exists on other planets or not

“Can you come with us to the company party this weekend?”

I’m not sure __

WHICH ANSWER IS WRONG?

• if or not I can come.

• if I can come or not.

• whether I can come.

• whether I can come or not.

“Did Charlie sell his BMW already?”

Let’s find out __

WHICH ANSWER IS WRONG?

• whether Charile has sold his BMW already.

• if Charlie has sold his BMW already.

• if or not Charlie has sold his BMW already.

• whether Charlie has sold his BMW already or not.

“Does that new laptop have a detachable keyboard?”

We want to know __

WHICH ANSWER IS WRONG?

• if that new laptop has a detachable keyboard.

• if that new laptop has a detachable keyboard or not.

• whether or not that new laptop has a detachable keyboard.

• whether that new laptop or not has a detachable keyboard.

“Are we there yet?”

The kids are asking __

WHICH ANSWER IS WRONG?

• if we're there yet.

• if we're there yet or not.

• if or not we're there yet.

• whether we're there yet.

“Is the boss going to hire any new workers next month?”

I wonder __

WHICH ANSWER IS WRONG?

• whether the boss is going to hire any new workers next month?

• whether the boss is going to hire any new workers next month.

• whether or not the boss is going to hire any new workers next month.

• whether the boss is going to hire any new workers next month or not.

“Should we wait for your sister?”

I asked __

WHICH ANSWER IS WRONG?

• if should we wait for your sister.

• if we should wait for your sister.

• whether we should wait for your sister or not.

• whether we should wait for your sister.

“Have you ever played lacrosse?”

Tell me __

WHICH ANSWER IS WRONG?

• whether you have ever played lacrosse.

• if you have ever played lacrosse.

• if you have ever played lacrosse or not.

• if have you ever played lacrosse or not.