What is the difference between whether and if usage?

whether and if are used as "whether" and "whether" have similarities and differences in usage.

1. Similarities.

and if can lead to object clauses, often placed after verbs such as see, ask, learn, tell, wonder, doubt, find out, etc.

For example, he asked me whether is I could help him i want to know whether/if he lives there.

and if can be used as formal subject clauses with it. Such as: it's uncertain whether/if he'll come this evening.

3.After be uncertain doubtful, whether is often used to guide the object clause, and sometimes if, as in: we are uncertain whether if mary will come

2. Differences.

It can be placed at the beginning of the sentence to guide the subject clause, but if cannot. For example: the 2000 Olympic games will be in Beijing is not known yet

The answer is c. It can be used after a preposition to lead an object clause, whereas if cannot. e.g. success depends on whether we make evough effort

Leadable predicative clauses, if not. For example: the puestion is whether it is not worthdoing

4.When leading an equipositional clause after a noun, use whether instead of if. Such as:

the puestion whether the students answered correctly should be decided by the teacher.

After can be connected infinitive, and if can't. For example: please tell us whether to go or stay here

6.After some verbs (e.g. discuss), only whether can be used instead of if to guide the object clause. Such as:

we discussed whether we should close the shop.

7.When guiding the negative concept in object clauses, only if can be used instead of whetherFor example: he asked me if I hadn't finished my work.

If can only receive an object clause.

Wether can be used in noun clauses.

The main differences between whether and if are different meanings, different usages, and different emphasis.

First, the meaning is different.

1、whether

conj.Whether; In spite of; Irrespective of.

2、ifconj.If; Even though; Whenever.

n.Condition; Conceive.

Second, the usage is different.

1、whether

Whether is used as a conjunction that means "whether, is not" and leads to a noun clause or verb infinitive phrase.

Wether can also lead to a concession adverbial clause meaning "regardless, regardless", and the simple modern tense is usually used in the subordinate clause instead of the future tense.

i'm uncertain whether to go or not.

I'm not sure if I'm going or not.

2. IFIF guides conditional adverbial clauses, which can be real conditional clauses or virtual conditional clauses. If it is a true conditional clause, the predicate is in a declarative mood, indicating that the possibility is very high, and the solution of "if" and "if" is usually used in the simple present tense instead of the simple future tense; If the if clause is will, it indicates the willingness.

If the clause is a subjunctive conditional clause, the predicate verb should be used as a subjunctive mood to indicate that it is unlikely or contrary to past facts, and it should be solved as "if, if". It can refer to the past situation, as well as to the present and future situation. Refers to future situations when were to or should.

i can give you a round neckline if you prefer.

Third, the focus is different.

1、whether

When meaning "if, if", the whether clause simply indicates the facts; whether can be used in indirect interrogative sentences after the preposition; whether can be used in front of "to + verb primitive"; Wether can guide the subject and the predicative clause to quarrel.

When meaning "whether", whether is mostly used in written language, which can be used in conjunction with or or not, in addition to the object clause, it can also lead to the subject clause, the predicative clause, the copositional clause or the infinitive.

2. If means "if, if", the if clause can express hope; if cannot be used in indirect interrogative sentences after a preposition; if cannot be used in front of "to + verb form"; If cannot guide the subject or predicative clause.

When it means "whether", if is used as "whether", it is mostly used in colloquial language, leading to object clauses, and cannot be directly used in conjunction with or not.

The differences between the usage of whether and if are as follows:

Wether can be placed at the beginning of the sentence to guide the subject clause, but if cannot, whether can be used after a preposition, leading the object clause but if cannot. whether leads the copositional clause after a noun with whether instead of if.

In the object clause, both if and whether express "whether", which can be used interchangeably, if is more colloquial, and whether is more formal. When there is an or not, whether is generally used instead of if. The stool rolls this.

Whether is mainly used as a conjunction (whether; Regardless of it), preposition (which of the two). For example, whether such work is a matter of debateTranslation:

Whether this work will be useful or not remains to be seen. In addition, I would like to add its fixed collocation: whether ......or……The meaning of the expression is "Zao Xun doesn't care, no matter ......."It is ...... to prepare God”

If can be used as a noun (to indicate something that could happen) or as a conjunction (if, if). If is usually used to lead a conditional adverbial clause. For example, he will be happy if you do that

Translation: If you do that, he'll be happy.

Difference and usage of if and whether:

1. If as a subordinate conjunction, it guides the conditional adverbial clause with the meaning of "if". Special attention should be paid to the conditional adverbial clause guided by if in the simple present tense and the main clause in the simple future tense, i.e., "the subject will come from the present".

if it doesn't rain tomorrow，we will go on a picnic.

If it doesn't rain tomorrow, we'll go on a picnic.

2. If whether can lead the object clause, which means "whether", and the guide word has actual meaning (whether or not) in the clause, but does not make any components, so it cannot be omitted. It is a tone of uncertainty that is transformed from a general question.

if usage. 1. If is used as a subordinate conjunction to guide conditional adverbial clauses, concession adverbial clauses and noun clauses.

2. If guides the conditional adverbial clause, which can be a real conditional clause or a virtual conditional clause.

3. If can omit be and subject in the conditional clause of if guidance.

4. The conditional clause guided by if is sometimes followed by only to strengthen its tone, indicating that the speaker is very eager for the conditions proposed by someone to be fulfilled.

5. If can guide the concession adverbial clause, as "although, even if" solution, often and even with caution.

6. If can guide the noun clause as a "whether" solution, often placed after verbs such as ask, doubt, know, learn, see, wonder, etc. It is generally used in spoken language and cannot be used at the beginning of a sentence.