In English, you can avoid repeating an entire predicate by using a short helping verb (like "she did too"). In Swedish, you can't leave the verb hanging. You must use det (it/that) to stand in for the previous action or description.
Place det at the start of the second clause. Because of the V2 (verb-second) rule, the verb must immediately follow det, pushing the subject after the verb. For most action verbs, use a form of att göra (to do) as your helping verb.
| I think that the theme is interesting, and she does too. | Jag tycker att temat är intressant, och det gör hon också. |
| He did not understand the theme, but I did. | Han förstod inte temat, men det gjorde jag. |
Using "Vara" and "Ha"
If the first clause uses att vara (to be) or att ha (to have), repeat that specific verb instead of using göra. The structure remains the same: det + verb + subject.
| The plot is unpredictable, and the ending is too. | Handlingen är oförutsägbar, och det är slutet också. |
| She has a literary style, and he does too. | Hon har en litterär stil, och det har han också. |
Negatives and Disagreements
To state that someone did not do something, place inte directly after the verb and before the subject. This order puts a strong contrastive emphasis on the person disagreeing.
| She liked the setting description, but I did not. | Hon gillade miljöbeskrivningen, men det gjorde inte jag. |
To agree with a negative statement (like "neither did the ending"), add heller (either) to the end of the sentence.
| The characterization did not work, and the ending did not either. | Gestaltningen fungerade inte, och det gjorde inte slutet heller. |