lt is a quarter after six.有没有这句话呢？如果有，那他又是什么意思呢？

没有,只有 it's a quarter past 6. 6:15
it's a quarter to 6 5:45
技巧:30分钟以前用past,例如,6:05就是 it's five past 6
30分钟以后用to 例如,6:45 就是 it's a quarter to 7

没有哈~
lt is a quarter to six
5:45
lt is a quarter past six
6:15

有，意思是六点十五分