一会儿这样，一会儿又那样用英语怎么说

怎样用英文说“一会儿这样，一会儿又那样”，或者“一下子这样，一下子那样”，比如：天气怎么一下下雨一下出太阳的。

English weather is very inconsistent; one moment it's raining and the next it's sunny.
英国的天气反复无常,一会儿下雨,一会儿又放晴。

He blows hot one minute and cold the next; I never know where I am with him.
他一会儿这样，一会儿那样，我根本就不知该怎样才能和他相安无事。

Jane doesn't know if she's going to the picnic. She's off again, on again about it.
简不知道自己是不是要去参加野餐，她一会儿这样，一会儿那样。

One moment she says she hates him, and the other she is completely in love.
她一会儿说恨他，一会儿又彻底爱上了他。

She went downstairs to fetch boiling water in this moment and cleaned the floor in that moment,she is busy all the time.
她一会儿下楼打开水,一会儿又擦地板,一直在忙。

afterawhile;inamoment;amomentlater;