begin的现在分词和过去式是什么

begin例句

The project is beginning to show results.

这项工程开始显出成效。

I was beginning to think you'd never come.

我开始以为你是不会来了。

The pressure of work is beginning to get to him.

工作的压力使他烦恼起来。

We began work on the project in May.

我们于五月份启动了这项工程。