Breakdown of Не откладывай дела, которые мы начали!
не
not
мы
we
дело
matter, business
который
which / who / that (relative pronoun)
Questions & Answers about Не откладывай дела, которые мы начали!
Why is the imperfective verb откладывай used here when we are talking about specific tasks we already started?
In Russian, negative imperatives (telling someone not to do something) almost always use the imperfective aspect, even if referring to specific objects. Using the perfective here would change the meaning to a warning about accidentally doing it, rather than a direct command not to do it.
To practice this lesson's topic, how would the meaning change if I said Не откладывай всякие дела instead?
Adding всякие means 'all sorts of tasks' or 'all manner of tasks.' This would sound contradictory in this sentence because которые мы начали points to a specific, known set of tasks, whereas всякие implies a random, diverse, or non-specific assortment.
If I wanted to say 'Do not put off every task we started,' should I use a form of каждый or всякий?
You would use каждое дело (every task). Каждый focuses on each individual item within a specific set, which fits perfectly here. Всякий focuses on the variety or type of things, which doesn't fit when you are already restricting the tasks to the specific ones you both started.
What case is которые in here?