Quote Originally Posted by zorro View Post
Thanks, Yulia for your detailed explanation. That helps.

Here are some more I'm not sure about from the same exercise:
--Можно (ask) ещё несколько вопросы?
--Пожалуйста, я люблю, когда студенты (ask) умные вопросы.
Is it perfective for the first and imperfective for the second? задать/задают?
Thanks,
Z
You are always welcome. Всегда пожалуйста!

You are quite right!

- Можно ЗАДАТЬ (perfective) еще несколько вопросОВ?

( the student here intends to ask his questions at one time, e.g. during the lecture he is attending, not over a period of time.
Therefore, his asking questions is viewed as a singe action that will be completed upon the professor's permission.)

- Пожалуйста, я люблю, когда студенты ЗАДАЮТ (imperfective) умные вопросы.

(Here the professor refers not to a single, specific one-time action, but rather to his habit of gladly answering the clever questions every time they are asked... Besides, characteristic, habitual and repetitive actions are expressed by the verb in its present tense-form, and present in Russian is imperfective only.)

Good job