"They are too busy and too tired to cook dinner every night."
“他们实在是太忙碌太疲惫而不能每天晚上下厨做晚饭.”
“too.to."结构：太.而不能.
同义句：They have been so busy and tired that they can not manage to cook dinner every night.
"so...that” 结构：如此.以至于