* Đồng ý khẳng định với "so"
Cấu trúc: S1 + V1, so + trợ động từ/tobe + S2
`1`. I like playing chess, so does my father.
`2`. She is a doctor, so is my mother.
* Đồng ý khẳng định với "too"
Cấu trúc: S1 + V1, S2 + trợ động từ/tobe, too
`1`. She likes eating apples. I do, too.
`2`. My father likes playing the piano. My brother does, too.
`3`. She is wonderful. I am, too.
* Đồng ý phủ định với "either"
Cấu trúc: S1 + V1. S2 + trợ động từ/tobe(phủ định) , either
`1`. I don't like chicken. My father doesn't, either.
`2`. I am not at the supermarket. My mother isn't, either.
* Đồng ý phủ định với "neither"
Cấu trúc: S1 + V1. Neither + trợ động từ + S2
`1`. I didn't play football. Neither did my friends.
`2`. I don't go to schhol. Neither does my sisiter.
`3`. I don't eat rice. Neither does my mother.
