make up one's mind   (TTS發音)

decide；choose what to do； determine決心

    They made up their minds to sellthe house. 他們下決心要把房子賣掉。

    Look， I've thought about it a lot，and now I've made up my mindDyou can borrow my car！瞧，這件事我已想了許多，現在我主意已定，你可以借用我的車了。