Misc: What uncomely creature inspired sailors tales of mermaids?

Questions

Literature : From which Shakespeare play is this line taken: Double, double?

Literature : From which Shakespeare play is this line taken: Goodnight, goodnight! parting is such sweet sorrow, That I should say goodnight till it be morrow.?

Literature : From which Shakespeare play is this line taken: To be or not to?

Literature : From which Shakespeare play is this line taken: What in a name That which we call a rose, by any other name would smell as sweet.?

Literature : How many lines are in a sonnet?