CC 約4年以前 have當一般動詞時,後面為了不重複就會用助動詞代替,my brother是三單,故用does代替has(不是have)。 have當助動詞時(完成式),後面才會用have:I have eaten breakfast, but my brother hasn't. CC 約4年以前 be動詞後面用be動詞(過去式也一樣):I am a teacher, but my brother isn't. I was a teacher, but my brother wasn't. CC 約4年以前 一般動詞就用do取代,三單用does,過去式用did:I don't teach English, but my brother does.(my brother三單用does取代) I didn't teach English, but my brother did.(過去式) 留言
be動詞後面用be動詞(過去式也一樣):I am a teacher, but my brother isn't.
I was a teacher, but my brother wasn't.