Когда ставить в предложении at in to

at это "к" или "на", in это "в" или "во" как в пример дословно на 8 часов

This is my pen and that's it. is this your pen? (общий) is this your pen or pencil? (альтернативный) whose pen is this? (специальный) this is my pen,isn't? (разделительный) what is this? (вопрос к подлежащему) i don't know your address. i don't know your address, do i? ( разделительный) do i know your address? (общий) don't i know your address or name? ( альтернативный) who doesn't know your address? (вопрос к подлежащему) what don't i know? (специальный ) my friend gave me his computer. my friend gave me his computer,didn't he? (разделительный) who gave me a computer? ( вопрос к подлежащему ) what did my (уour) friend give me() did my (your) friend give me(you) his book or his computer? (альтернативный) did my (your)friend give me(you) his computer? общий she wrote her own poem. she wrote her own poem,didn't she? (разделительный) did she write her own poem? (общий ) who wrote her own poem? (вопрос к подлежащему) what did she write? (специальный) did she write her own poem or essay? (альтернативный? his english is better than mine. his english is better than mine,isn't it? (разделительный) is his english better than mine(yours)? общий whose english is better than mine(yours )? специальный is his english or chinese better than mine(yours)? альтернативный what is his better than mine(yours) ? (вопрос к подлежащему )