VS.

When vs. If

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Whenadverb

(interrogative) Used to introduce questions about time.

‘When will they arrive?’;

Ifconjunction

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

‘If it rains, I shall get wet.’;

Whenadverb

Used to introduce indirect questions about time.

‘Do you know when they arrived?’; ‘Do you know when they will arrive?’; ‘Do you know when they arrive?’;

Ifconjunction

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

‘If A, then B, else C.’;

Whenadverb

At an earlier and less prosperous time.

‘He's mister high and mighty now, but I remember him when.’;

Ifconjunction

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

‘I would prefer it if you took your shoes off.’; ‘I would be unhappy if you had not talked with me yesterday.’; ‘If I were you, I wouldn't go there alone.’;

Whenadverb

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

Ifconjunction

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

‘If that's true, we had better get moving!’;

Whenadverb

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

‘That was the day when the Twin Towers fell.’;

Ifconjunction

Although; used to introduce a concession.

‘He was a great friend, if a little stingy at the bar.’;

Whenconjunction

At what time.

‘They were told when to sleep.’; ‘He doesn't know when to stop talking.’;

Ifconjunction

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

‘I don't know if I want to go or not.’;

Whenconjunction

At such time as.

‘I’m happiest when I’m working.’;

Ifconjunction

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

Whenconjunction

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

‘It was raining when I came yesterday.’; ‘The show will begin when I get there.’; ‘The game is over when the referee says it is.’; ‘Be careful when crossing the street.’; ‘Pay attention when spoken to.’; ‘When (you are) angry, count to ten before speaking or acting.’; ‘That time when the dog stole the turkey from the table.’;

Ifconjunction

Introducing a relevance conditional.

‘I have leftover cake if you want some.’;

Whenconjunction

Since; given the fact that.

‘I don't see the point of putting up Christmas decorations when I am the only person who is going to see them.’;

Ifnoun

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

Whenpronoun

(interrogative) What time; which time.

‘Since when do I need your permission?’;

Ifconjunction

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

‘Tisiphone, that oft hast heard my prayer,Assist, if Œdipus deserve thy care.’; ‘If thou be the Son of God, command that these stones be made bread.’;

Whennoun

The time at which something happens.

‘A good article will cover the who, the what, the when, the where, the why and the how.’;

Ifconjunction

Whether; - in dependent questions.

‘Uncertain if by augury or chance.’; ‘She doubts if two and two make four.’;

Wheninterjection

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

Whenadverb

At what time; - used interrogatively.

‘When shall these things be?’;

Whenadverb

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

‘Kings mayTake their advantage when and how they list.’; ‘Book lore ne'er served, when trial came,Nor gifts, when faith was dead.’;

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.

‘I was adopted heir by his consent;Since when, his oath is broke.’; ‘Come hither; mend my ruff:Here, when! thou art such a tedious lady!’; ‘When as sacred light began to dawn.’; ‘When that mine eye is famished for a look.’;

Whenadverb

as soon as;

‘once we are home, we can rest’;

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