Differences in usage between weather and if

The difference between what should be and what if. Because both refer to whether or not.

1. Yes or no

conj。

1. Is it:

Ask her if she is willing to help.

Ask her if she can help.

2. Is it ... or ...:

Whether he drives or flies, he will be on time.

Whether he comes by car or by plane, he will arrive on time.

3. One of them:

Taxes to support the war, just or not.

Taxes to support just or unjust wars

pronoun

[Archaic] Which of the two; Either (of the two)

Adjective (abbreviation for adjective)

[Archaic] Which of the two; Either (of the two)

2. If

If [if]

conj。

1.[ indicating condition or hypothesis] if; If, if, if:

If I knew, I would say.

If I knew, I would say it.

If I were you, I would fail.

If I were you, I might fail.

2. despite; Although; Even if:

If he is small, he is strong.

Young as he is, he has great strength.

If I am wrong, you are wrong.

Even if I am wrong, you are not.

3. Is it:

I don't know if he is at home.

Ask him if he is at home.

Ask him if he is at home.

I don't know if he is at home.

4. When …, just:

If I don't understand, I will ask questions.

I don't understand, just ask.

If I have any questions, I will ask.

I ask questions.

5.[ expressing wishes and sighing] If ...:

If I hadn't lost my wallet!

If only I hadn't lost my wallet!

[Used with will, could, etc. A polite request]:

If you are willing to wait for a while, they will come back soon.

Please wait a little longer, they will come back soon.

[Used with negative verbs to express surprise, anger, etc. ]:

If it wasn't for Stephen!

Isn't that Stephen!

Noun (short for noun)

1. problem; Hypothesis; Something in doubt

2. Conditions, necessary conditions; rule