When vs. If

Whenadverb

(interrogative) Used to introduce questions about time.

Whenadverb

Used to introduce indirect questions about time.

Whenadverb

At an earlier and less prosperous time.

Whenadverb

(indirect question) Used to refer to doubts about time.

Whenadverb

(relative) At which, on which, during which. Often omitted or replaced with that.

Whenconjunction

At what time.

Whenconjunction

At such time as.

Whenconjunction

At the time of the action of the following clause or participle phrase.

Whenconjunction

Since; given the fact that.

Whenpronoun

(interrogative) What time; which time.

Whennoun

The time at which something happens.

Wheninterjection

That's enough, a command to stop adding something, especially an ingredient of food or drink.

Whenadverb

At what time; - used interrogatively.

Whenadverb

At what time; at, during, or after the time that; at or just after, the moment that; - used relatively.

Whenadverb

While; whereas; although; - used in the manner of a conjunction to introduce a dependent adverbial sentence or clause, having a causal, conditional, or adversative relation to the principal proposition; as, he chose to turn highwayman when he might have continued an honest man; he removed the tree when it was the best in the grounds.

Whenadverb

Which time; then; - used elliptically as a noun.

Whenadverb

as soon as;

Ifconjunction

Supposing that, assuming that, in the circumstances that; used to introduce a condition or choice.

Ifconjunction

(computing) In the event that a statement is true (a programming statement that acts in a similar manner).

Ifconjunction

Supposing that; used with past or past perfect subjunctive indicating that the condition is closed.

Ifconjunction

Supposing that; given that; supposing it is the case that.

Ifconjunction

Although; used to introduce a concession.

Ifconjunction

Whether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs.

Ifconjunction

(usually hyperbolic) Even if; even in the circumstances that.

Ifconjunction

Introducing a relevance conditional.

Ifnoun

(informal) An uncertainty, possibility, condition, doubt etc.

Ifconjunction

In case that; granting, allowing, or supposing that; - introducing a condition or supposition.

Ifconjunction

Whether; - in dependent questions.