Summarize the first two acts in a few sentences.
Sure. Act I:
The ship wrecks, stranding the people on it on the island where Propero lives with Miranda, Caliban and the spirit Ariel. Ferdinand (from the ship, and originally from Naples) and Miranda fall in love.
Sebastian, Antonio are talking when Ariel puts them to sleep.
Caliban runs into Trinculo and then Stephano. The two men get him drunk.
For more detailed summaries, you may want to see the enotes study guide.