Questions & Answers about Hon hoppade till, och det gjorde jag också.
Why use hoppade till instead of just hoppade?
The particle till expresses a sudden, brief, or involuntary action. While hoppade just means jumped (like jumping over a puddle), hoppade till specifically means to flinch, startle, or jump in surprise.
Where does the stress go when pronouncing hoppade till?
Because this is a particle verb, the stress falls heavily on the particle till. The verb hoppade is left unstressed and spoken a bit faster.
What is the purpose of det in the second half of the sentence?
In English you can simply say I did too, but Swedish generally requires an object for the verb gjorde (did) when referring back to a previous action. The pronoun det (it/that) acts as a placeholder for the entire action of jumping in surprise. You are literally saying and that did I too.
Why is the word order gjorde jag and not jag gjorde?
This is the V2 (verb-second) rule in action. The second main clause starts with the object det, which takes up the first position. The verb gjorde must take the second position, forcing the subject jag to come right after it.