动词作主语时什么时候用to do什么时候用doing

Answer 1

若此动作的逻辑主语暗中有所指用to do,暗中无所指用doing
1.To see is to believe.暗示有人要撒谎。
2.Seeing is believing.只是一个普通的思想教育。
当动作为一次性具体性将要发生性时用to do,当动作为经常性反复性习惯性时用doing.
1.To climb that tall tree isn't difficult for him.爬那颗大树
2.Climbing trees is easy for him.经常爬树