Usa "do" con preguntas.
When do we go?
How do/can I get to know you?
When did the band begin? ("did' = tiempo pasado de "do")
Did you see the show?
What did you do?
Where do we go now? (Where will we to now? Where are we going now?)
What did you write? Do you want...? Do you think...."
Also, with "not" statements: I do not see the need...., I do not think... (don't think"