When it's on it's on

"It's on it's on the 翻译should I let youknow when it's on? When is Mother's Day?It's on the second Sunday in May.用on 语法 "It's just not on. It's on the sofa. it's on THE TABLE it's on sunday是什么意思 when's your father's birthday? It's on the (3rd) of Feburday When is the school film on?It's on ____ Friday evening. When is your birthday?----It's (on) March tenth,在回答中用不用加介词on It's depend on you 还是It depends on you