可以,如:
1、不定式的逻辑主语是泛指的,不明确的人或人们.
a) To see is to believe.
b) To plan is to act.
c) It always pays to tell the true.
2.有时,通过句中的某个名词或代词,我们可以知道不定式的逻辑主语.
a) To clean the window is your duty.( 不定式的逻辑主语是 “you”)
b) To point out the difficulties is my purpose.( 不定式的逻辑主语是 “I”)
这些情况都可以放句首.