It's twelve people go to school by bike

不成立.
It's twelve and people are going to school by bike.
It's twelve and people are riding to school.

===
it等于It has的话应该是不对的,There's 才对.
There's 12 people going to school by bike.

it has不成立，个人以为应该是：
There is twelve people to go to school by bike.

成立
现在12点了,人们骑车去上学

应该成立
意思是：现在十二点了，人们骑自行车去上学。

the twelve people go to school by bike。
lt 不行 它是12个人上学