take it on walks.为什么要s,为什么要on?

let's make it at 3 o'clock on saturday afternoon ,为什么要用介词it? 为什么是it’s down Center Streen on the right 而不是It’s on Center S it was sunday,a never get up early on sundays.sunday为什么要加S It's hard being on your own为什么要用being呢 It's not easy to cross the rive on a ropeway为什么要加to I'll take care of it on my lunch break.为什么用介词on 1,You walk,it walks,too.You stop,it stop,too.It's not on the Many people like take a trip on holiday.take是不是要变成taking?为什么 take the second turning on the left中动词为什么要用take? A a snake is a strange animal. it walks on its ribs and it s 为什么How do you 要和 turn it on 搭配,而不和 turn on it 搭配? improve on sth.为什么要用on