菜鸟提问:I have two accounts at my bank ,I have one savings account and one checking account.请问大虾.上面这句话为什么Savings 后面加S 而checking 没加呢?

I have two brothers对too提问 I have two cakes between meals对two提问 I have two brothers.（对two提问） I have two apples for dinner就“two提问 菜鸟提问:I have two accounts at my bank ,I have one savings account and one checking account.请问大虾.上面这句话为什么Savings 后面加S 而checking 没加呢? I have two books 就划线部分提问 i have two brother对划线部分提问 I have (two) sisters.(对括号部分提问) I have two soccer balls.对(two soccer balls)划线部分提问 ____ ____ you have? I have known Sandy for two years(对for two years提问) I have two English books.怎么划线提问,划线的是two. I have read two thirds of the book对two thirds划线提问 就I have two good friends in my class中画线部分是two的提问 I'd like to have two kilos of rice.对two kilos of 提问 I have a basketball for two hours.对for two hours进行提问 I have two big triangles否定句、一般疑问句、肯定回答、否定回答、对two提问 I have two maths lessons today.对（two)画线部分提问. I have math for two hours对画线部分提问(划线部分是for two hours )