WHEN - als, wann,ob oder wenn?

Chose the right word from the pop-up list.

ALS = single event in the past (an event that only occurred once) e.g. when I was seven; or when I got home
almost always used with the simple past


WENN = (a) a repeated event (e.g. “whenever” it happened) e.g. whenever I ate ice cream, I got sick; or when I’m tired, I fall asleep
used with the present, future, or perfect tenses (rarely simple past)


= (b) if, when (on condition that) e.g. if it’s raining, we can’t go; or if he didn’t come, we couldn’t go.
used most often with the present or subjunctive tenses


OB = whether, if (yes-no answer) e.g. do you know whether / if she’s coming?
used with any tenses


WANN = when (in questions or reported questions), what time or day or year e.g. do you know when she’s coming? when does class start?