Learn Turkish: İhtiyar adam bütün gece koltukta uyuyor olacak. - The old man will be sleeping in the armchair all night.

It is formed by attaching the present continuous suffix -yor to the main verb (uyuyor, meaning 'is sleeping') and following it with the future tense of olmak (olacak, meaning 'will be'). Together, they literally mean 'will be sleeping', showing an ongoing action in the future.

What is the difference between ihtiyar and yaşlı?

Both words mean 'old' when referring to people. Yaşlı is the standard, everyday word for 'old' or 'aged'. İhtiyar is a slightly more traditional or literary word, closer in feeling to 'elderly'.

Why is there no case suffix on bütün gece to mean 'for all night'?

In Turkish, phrases that express a duration of time, like bütün gece (all night) or bütün gün (all day), act directly as adverbs. You do not need to add the locative suffix (-de) or accusative suffix (-yi) to show how long an action takes.

The English translation says 'in the armchair'. Why does koltukta just use the standard locative suffix instead of a word for 'inside'?

English uses 'in' for armchairs and 'on' for regular chairs, but Turkish generally just uses the locative suffix -ta/-te/-da/-de (meaning at, on, or in) for sitting on furniture. Saying koltuğun içinde (inside the armchair) would sound very odd, as if the man were physically stuffed inside the upholstery.