我不是不想去,而是没有时间。
wǒ bùshì bù xiǎng qù , érshì méiyǒu shíjiān 。
It's not that I don't want to go; I just don't have time.
他不是中国人,而是日本人。
tā bùshì zhōngguórén , érshì rìběnrén 。
He isn't Chinese; he's Japanese.
问题不是钱,而是时间。
wèntí bùshì qián , érshì shíjiān 。
The problem isn't money but time.