when they are four or five years old=.同义句转换

问题描述:

when they are four or five years old=.同义句转换
when they are four or five years old=.
同义句转换

when they are four or five years old=at the age of four of five.David wakes upat8 o'clock everymorning.=Davidsleeps------8o'clockevery morning.David wakes upat8 o'clock everymorning.=Davidsleepstill/until8o'clockevery morning