Could someone who actually studied grammar at school (or anywhere else) please explain to me the difference between the topic and the subject of a sentence. I'm asking because my Japanese grammar book assumes that I know and I don't and I'm therefore unsure of when to use some particles...
'When the topic of the sentence is different to the grammatical subject, the grammatical subject is followed by ga (the topic is followed by wa)'
I have an example:
I don't understand English: Eigo ga wakaranai desu (literally, English ga don't understand)
I don't eat Japanese food: Nihonshoku wa tabenai desu (literally, Japanese food wa don't eat)
I'm sure I should be able to figure this out, but I can't seem to. Help please!