Breakdown of Я надеюсь, что завтра будет тепло.
быть
to be
завтра
tomorrow
что
that (conjunction)
тепло
warm (adverb)
надеяться
to hope
Questions & Answers about Я надеюсь, что завтра будет тепло.
Why is there a comma before что?
In Russian, you must always put a comma before conjunctions that start a new clause, like что (that), потому что (because), or если (if). English usually skips this comma, but it is a strict rule in Russian punctuation!
Why does the verb надеюсь end in -сь instead of -ся?
Надеюсь is the 'I' form of the reflexive verb надеяться (to hope). When a conjugated reflexive verb ends in a vowel (like the ю in the base form я надею-), the reflexive particle -ся shrinks to -сь. So we get я надеюсь.
Why is it будет тепло instead of using an adjective like тёплый?
To describe general weather conditions, Russian uses 'impersonal' sentences. You don't use a subject and an adjective; you just say 'it is warm' using the adverb тепло. To put this in the future tense, you simply add the 'it' form of the future tense verb 'to be', which is будет.
Since the current lesson is about если (if), could we use it instead of что here?
No, because this isn't actually a conditional sentence. A condition would be 'I will go for a walk IF (если) it is warm.' Here, you are stating a fact about what you desire: 'I hope THAT (что) it will be warm.' You should use что to connect verbs of thinking, knowing, and hoping to the thing you are thinking or hoping about.
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