が VS を

 When words such as「好き」「きらい」「できる」「たい」「ほしい」, that express states such as likes and dislikes, ability and hope are used in the predicate, and 【を】can be replaced.

 

Preference
わたしは彼(かれ)（が/を）好き	I like him	【が/を】is used to express the feelings of likes and dislikes for people.
わたしは犬(いぬ)がきらい	I hate dogs	【が】is used to express  preference  for things and animals

 

Ability	わたしは英語(えいご)（が/を）読(よ)める	I can read English
Desire (Verb +たい)	わたしはすし（が/を）食(た)べたい	I want to eat sushi
Desire (Adj ほしい)	わたしは時間(じかん)（が/を）ほしい	I want time　※It is common to use　【が】

 

※When a state or adjective word becomes a predicate(述語), and 【を】can be replaced. When a behavioral or verb-like word becomes a predicate, 【を】is selected.

For example, if you replace it with a word that strengthens the movement, such as 【ほしがる】, it is unnatural to replace it with 【が】

「だれでも，金(きん)メダルをほしがる」"Everyone wants a gold medal"