My bike is under repair.sth.be under repair是不是固定结构?

My bike is under repair.sth.be under repair是不是固定结构? under repair的意思 -Can I use your bike this afternoon?_______ is under repair. 请问：be in repair 和 be under repair 11请举例说明. The car is under repair.为何不是repairs? roof is under repair请教under在句中起什么作用?而为什么repair不用动名词形式表示正在进行呢 The car is in repair.和 The car is under repair.意思相同吗?若不同,谢 My bike is broken.It requires ______ (repair). under repair.under是介词,为什么后面不用ing形式 the highway leading to the city is under repair now为什么是leadi The library____ you often borrow books is under repair now.A he was lucky in the accident,but his __car is under repair.