【for + sth ,】【to + do sth,】都是表示做某事的目的,紧接着陈述要做的那件事.
一般来说,for 后面+ 名词.举例：
For your health,you have to keep doing exercise.
"为了您的健康,你得坚持做运动".
to 后面+ do sth (即动词原形）.举例：
To save time,we have to go by taxi.
"为了节省时间,我们得打的过去".