Sudden actions (till)

When you play a practical joke on someone, you usually expect a sudden reaction.

I was going to scare him with the prank.
Jag skulle skrämma honom med sprattet.

To describe sudden, brief, or involuntary actions in Swedish, add the particle till immediately after the verb. This changes the verb from a continuous action to a momentary reflex.

Brief and Involuntary Actions

For example, skratta means "to laugh," but skratta till means "to let out a short, sudden laugh."

He flinched when he saw the spider.
Han ryckte till när han såg spindeln.
I let out a short laugh when she flinched.
Jag skrattade till när hon ryckte till.

Startling and Jumping

This pattern works well for physical reactions to being scared, like jumping (hoppa till) or screaming (skrika till). The verb haja till specifically means "to startle."

The prank made the whole family jump in surprise.
Sprattet fick hela familjen att hoppa till.
I startled and gave a short scream.
Jag hajade till och skrek till.

Sudden Changes in State

Till also describes other brief or sudden changes in state, such as waking up briefly (vakna till) or shuddering suddenly (rysa till).

I woke up briefly because of the noise.
Jag vaknade till på grund av oljudet.
He had shuddered briefly before I opened the door.
Han hade ryst till innan jag öppnade dörren.