かえます or かえません?! Are these even words? While studying my notes I have かえます as meaning "can buy/able to buy" and かえません as "can't buy/not able to buy" but when I look these words up they do not appear. I translate my notes from audio lessons so the problem is probably that they are not properly transliterated. Any help would be appreciated :)

Japanese question If I said "Yana otenki desune" would this mean "It is bad weather isn't it?" I learn a lot of Japanese by listening to audio lessons but when I look up the word "Yana" it doesn't come up as "bad or unpleasant" like the lessons teach Perhaps I am hearing the word wrong.Could it be "iyana"? I want to write the correct word in my notes

I'm learning about the difference between hanashimasu and hanasemasu. I was reading some phrases and this one came up- Eigo o hanasemasu ka but I was taught to say Eigo ga hanashimasu ka Is it correct to say that hanasemasu ka= Can you speak and hanashimasu ka= Do you speak? And also, are the particles o and ga being used correctly here? Arigato gozaimasu