• 4.定语从句分为限制性定语从句和非限制性定语 从句。限制性定语从句用来限定先行词。如果拿 掉，剩余部分就失去意义不能成立或意思不清。
• 如：Those who want to go please sign their names here.
• 非限制性定语从句则是对先行词补充说明，拿掉 之后其他部分仍成立。
• 2.What has he put up outside his gate?
• He has put up ‘no parking’ signs outside his gate.
• Why has he put the stone head of Medusa • over his gate?
---No, this is the first time I _B__
here.
A. was
B. have been
C. came
D. am coming
(2) ---Have you __D__ been to our town
before?
---No, it‘s the first time I ___ here.
• The rain has stopped now.
• It has rained every day this week. • 4.have been/have gone的区别：
• I have been to Beijing.
• She has gone to Beijing.
• 5.短暂性动词可用于完成时，但不能与段时 间连用。但是，在否定句中可以这样。
• 1.The house, __A___ was destroyed in the terrible fire, has been repaired.
