i want to have a relaxation this weekand.为什么不是at\on this weekend?为什么不用加介词?而 what's you plan on the weekend?有on?什么时候要加,什么时候不要加?

I want to have a I want to have a I want to have a home. I want to have a picnic. I want to have a watch yours. i want to have a girlfriend I want to have a gilefriend I want to have a m___ plane I WANT TO HAVE A BEAUTIFUL WISH. i want to have i have a coat ,i want to buy a b i want to find a place to have supper.3904 I want to have a little time to accompany I want to have a hand to kill myself 是什么意思? I want to have a h____ to live in. I Have Some Want To 英语翻译汉语 I want to be a witch .I want to have my owe world. I don't want to go out this a__,because I want to have a rest.