The weather is very changeable at this time of year.

　　年年在這個時候天氣都變化無常。

　　The weather is very changeable at the moment.

　　現時天氣變化無常。

　　The forecast is for changeable weather.

　　預報針對的是變化無常的天氣。

　　The weather was very changeable last winter.

　　去年冬天天氣變化無常。

　　My boss has a changeable character.

　　我的老板性格多變。