To express "Me too" or "Me neither," English uses a short inverted structure where the auxiliary verb must match the previous sentence:
- Affirmative agreement: So + auxiliary verb + subject (So do I / So am I / So can I).
- Negative agreement: Neither + auxiliary verb + subject (Neither do I / Neither am I).
"I like tea." — 也So (助动词)do 我I.
"I like tea." — "Me too."
"I can't swim." — 也不Neither (助动词)can 我I.
"I can't swim." — "Neither can I."
Note: The auxiliary verb must match the tense/verb of the previous sentence: if the previous sentence uses are → So are they; if it uses don't → Neither do I.
Common Errors
- ❌ "I love this song." — ~~So am I.~~ → ✓ So do I. — The agreeing auxiliary must match the previous sentence: main verbs → do / does / did; be → am / is; can → can.
- ❌ "I don't like it." — ~~Me too.~~ → ✓ Me neither. / Neither do I. — Do not use too for negative agreements.
- ❌ "I can't swim." — ~~So can't I.~~ → ✓ Neither can I. — Negative inversion begins with neither / nor, never so + negative.
- To emphasize "really," avoid using very + verb: ❌ ~~I very like it.~~ → ✓ I do like it. / I really like it. — Placing the auxiliary do before the verb creates emphasis.