Breakdown of Он легко решил все задачи.
он
he / it (for a masculine noun) / it (for a neuter noun)
решить
to solve
задача
task
весь
all, the whole, everything, everyone (весь, вся, всё, все)
легко
easily; it is easy
Questions & Answers about Он легко решил все задачи.
Why is the word for "problems" задачи and not проблемы?
In Russian, a задача is a task, an objective, or a specific problem to be solved, like a math puzzle or a work assignment. A проблема refers to a difficulty, trouble, or a negative issue in life. Since he successfully completed them, they are tasks or exercises, so задачи is the natural choice here.
Could we use the imperfective verb решал instead of решил here?
You could, but it changes the meaning. The perfective решил means he successfully completed solving all of them, putting the focus on the final result. If you used решал, it would mean he was in the process of solving them or spent time working on them, but it doesn't guarantee he finished them.
What case is все задачи in, and why?
It is in the accusative case, plural, because it is the direct object of the verb решил (the things being solved). For inanimate feminine nouns like задача, the plural accusative form looks identical to the nominative plural (задачи), and the modifier все (all) also matches this inanimate plural form.
Is все here pronounced with a "ye" or a "yo" sound?
It is pronounced with a "ye" sound (все), meaning "all" for plural nouns. Learners often confuse it with всё (pronounced with "yo"), which means "everything" (neuter singular). Because Russian text usually omits the dots over the letter ё, you have to rely on context to tell them apart—here, it clearly modifies the plural noun задачи.
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