749 不定式作表语省去to的情况
◎ 在下列主语部分有do的结构后,作表语的不定式可省去to:
The most important thing we should do now is (to)remain cool-headed. 我们现在最应该保持冷静。
The first thing he did was (to)look for a guide. 他做的第一件事是找一个向导。
The thing to do now is clear the snow from the road. 现在要做的就是清除路上的积雪。