grammar → 也
TSUMUGU · TBCL 2 (est.) · 語法
grammar point · tier 3 · 也 also, too (parallel predicate)
· yě
Also: the new predicate holds the same as one already said.

字源 FORM what the parts do

也 is borrowed for the sound, no picture in its strokes. It stands right before the verb and points back to a predicate already laid down.

故事 STORY a scene to remember it by

One line already drawn; 也 lays a second beside it on the same track.
字源自撰記憶法
框 · Frame
[subj] 也 [verb / predicate]
觸 · Trigger
A second thing holds the same as the first you just said.
序 · The move
1Say the first predicate in full.Is there a prior clause for 也 to echo?
2Drop 也 in front of the second verb, not at the end.Does 也 sit before the verb, never sentence-final?
3Keep the second predicate parallel to the first.Is the second the same kind of claim, not a contrast?
例 · Examples
1hecanspeak中文Chinesealso會說日文Japanese
He can speak Chinese, and can speak Japanese too.
界 · Boundary
也 marks a parallel that matches a prior predicate (same again); 還 adds one more item to the same subject (and on top of that).
也 ties this predicate to another one; 都 sweeps a whole set under one predicate (all of them).
他會說日文也。 → 他也會說日文。 (也 sits before the verb, not at the end.)
我喜歡咖啡,也不喜歡茶。 → 我喜歡咖啡,但不喜歡茶。 (也 adds a matching claim, not a reversal.)
English drops too at the sentence end; 也 sits before the verb, never last.