如果一直到现在都是不努力的,I don't study hard. 或者 I don't study very hard.
如果是过去学习不努力,就用 I didn't study hard. 如果一直到现在都是不努力的,I don't study hard. 或者 I don't study very hard.
如果是过去学习不努力,就用 I didn't study hard.