i'm struggling to analyse the following items in terms of form, meaning and phonolgy, please help!
'look forward to'
'should have' (asked, for e.g.)
"Look forward (to)" is a phrasal verb meaning to "anticipate," and is most often used in a positive sense: "I look forward to your visit next month." However, one can also say, "you can now look forward to six months in prison."
In your second example, "should have asked," the "should" is an auxillary which gives the phrase the meaning "it would have been better if I had done something." Thus: "I should have asked him for the house keys before he left."