Student or Learner
Do you like fruit/vegetable? If I use the plural form of these two words, it will be wrong, right?
We say "Do you like fruits and vegetables?" or "Do you like fruit and veg?" In BrE, "fruit and veg" is a very common collocation and it's almost taken to be one food group.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.