[murasaki11]

For a long long time, I have always been saying the following types of sentences, always with が

かぎがある。
かぎがある？
かぎがありますか
かぎがない。
犬がいる。
犬がいる？
犬がいますか
犬がいない。
etc.

Something GA aru/iru

but recently I got very confused when my Japanese friend said I said something wrong. He asked if I had a boyfriend, I said

カレシがいない and he said no I should have said カレシはいない。


why? :S