"I go to bed at about 11 o'clock.句中为什么用"about"?

i go to bed at I go to bed at a( ) eleven. I go to bed at half past nine.[同义句】 I u____ go to bed at eleven-thirty I go to bed at 10 ____ night usually,go,i,bed,at,to,ten连成句子 I often go to bed at（）11 o'clock I go to bed at nine ten的同义句 I often go to bed at ten-thirty.同义句 I often go to bed at ten fifteen.同义句I often go to bed at ＿ ＿ ＿ ten. I go to bed at night 1.对go to bed提问2.对at night提问 （ ）do you usually go to bed?I usually go to bed at 9:00.括号里应该填什么? I go to bed early at night.I( )( )( )at night.改为反义句 I go to bed early at night改为反义句I｛｝｛｝｛｝at night. 连词成句,1.home,what,in,does,she,the,morning,leave,time2.busy,we,morning,the,in,always,are3.goes,mother,to,usually,at,eleven,bed,my4.usually,go,he,to,when,work,does5.practice,after,guitar,I,often,the,supper6.does,lunch,time,she,what,have7.do,abou bed,I,to,at,at,nine,go,night怎么连词成句 I go to bed at nine o'clock.用Mary代替I改写句子 My mother is a( ).I have ( )for lunch.I go to bed at( ).该怎样填?