Quote Originally Posted by Pravit
купил - perfective. Unless you mean he bought it on a regular basis, like stocking up a store or something.
I always screw up the two, thanks

Quote Originally Posted by Pravit
собака. IMO it is a bit idiomatic in English; I may be wrong here but it kinds of comes out as sounding like he literally loves the sun, as opposed to enjoying it when it is sunny:
Моя собака любит, когда солнечно.
No, that's fine in english. Generally you have to say he literally loves the sun for it to be taken that way.

Is the verb нужeн always preced by the word in dative? Also, why does писать need to be imperfective?

Thanks for your help.