这是美国人的用法,但有时英国人也这么用。
have/had主要是用在与to be连用时:
Theres a tall gred bird fishing in the river.
It has to be/must be a heron.
河里有一个大个的灰鸟在捕鱼。
那一定是一只苍鹭。
had+to be可表示说话人对过去可能发生的事认为是肯定无疑的:
There was a knock on the door.It had to be Tom.
有人敲门。肯定是汤姆。(他肯定是汤姆。)
had+to be也可用来代替 must+完成式:
I wonder who took the money.
It had to be Tom./It must have been Tom.Hes the only one who wasthere.
我不知道谁把这钱拿去了。
肯定是汤姆。当时只有他在那里。
但为了避免混淆,建议学生们还是尽量用must的各种形式。
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