The little girl helped the old man pick up the bag from the ground.pick up 为什么不用过去式?

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The little girl helped the old man pick up the bag from the ground.pick up 为什么不用过去式?

The little girl helped the old man pick up the bag from the ground.pick up 为什么不用过去式?
The little girl helped the old man pick up the bag from the ground.pick up 为什么不用过去式?

The little girl helped the old man pick up the bag from the ground.pick up 为什么不用过去式?
这里是固定搭配help sb.do sth.

help sb to do sth,用时省略不定式符号to,因此用动词原形

help sb.(to) do sth,中间这个to可以省略。

这是5个英语基本句型中的”主谓复宾“。即:”主语+谓语+宾语+宾语补足语“
主语The little girl +
谓语helped+
the old man+
宾语补足语pick up the bag from the ground。
这里的不定式pick up the bag from the ground省略了to.