When must weather be used in an object clause? When

Your question should be: When must you use whether in an object clause, and when must you use if? ?

Weather means weather. whether? means almost the same as if. Its usage is as follows

whether?conj.? [Continue with noun clause] Whether? [Continue with concession adverbial clause] Regardless , no matter

Ask him whether he can come.?Ask him whether he can come.

I wonder whether it is true.?I wonder whether it is true.

The question is whether he can do it.?The question is whether he can do it.

Whether we help him or not, he will fail.?Whether we help him or not, he will fail. .

Idioms

whether... or... is... or... or... or...; either... is... Regardless of...or...

whether or no [not] whether or not; in any case; no matter what; in short; must

if or whether introduces an object clause, as When talking about "whether", it is often placed after the verbs ask, see, say, know and find out. Under normal circumstances, the two can often be used interchangeably, and if is often used in spoken language. For example:?

Example 1 Nobody knows whether (if) it will rain tomorrow. No one knows whether (if) it will rain tomorrow.?

Example 2 Lucy asked whether (if) they had a cotton sweater. Lucy asked whether (if) they had a cotton sweater. woolen sweater.?

The difference between if and whether:?

1) Whether can only be used before the infinitive of the verb. For example, I can't decide whether to stay. I can't Decide whether to stay.

2) In the fixed combination of whether ... or not, such as? I want to know whether it's good news or not. I want to know whether it's good news or not. He wondered whether she liked it or not.

3) After a preposition, you can only use whether. For example, His father is worried about whether he lose his work. His father is worried about whether he loses his job.?

< p>4) When the object clause is placed at the beginning of the sentence to express emphasis, you can only use whether. For example? Whether they can finish the work on time is still a problem. Whether they can finish the work on time is still a problem.?

5) You can only use whether to introduce predicative clauses, not if. For example? The problem is whether we will go there by bus or by plane.