if从句的简化 将if从句换一种表达方式避免单调乏味 例子或者简化方式

if it rains,i will stay at home.
in case that it rains,it rains,i will stay at home.
Once it rains,i will stay at home.
As long as it rains,i will stay at home.
if it doesn't rain,i will stay at home.
Unless it rains,i will stay at home.