schalten

Ich schalte das Licht ein.

I switch on the light.

The verb stem is in position 2, and the separable prefix comes at the end.

Du schaltest den Fernseher aus.

You switch off the television.

With du, the verb usually ends in -st.

Schaltet ihr den Computer ein?

Do you switch on the computer?

In a yes-or-no question, the verb comes first.