how can i find the purpose of a speaker in the listening it 's all about my toefl lessons.i always have a hard time in grabing the purpose of the speaker in the listening test.for example,the questuion can be "why does the professor say this",and "what can be inferred when the student says this",i feel terrible when i face this kind of problems.i tried to watch "friends",but there wasn't a grat help,what can i do now.i really appreciated your help.thank you.