begin 的過去式和過去分詞是什麼

Work has begun on the construction of the new airport.

新機場的修建已經開工。

The firm has begun a major push into the European market.

這家公司已展開了對歐洲市場的重要攻勢。

It was tough talk, coming from a man who had begun the year in a hospital bed.

這話出自年初住進醫院的一位男子之口，語氣很強硬。

He began by making a few general observations about the report.

開頭他先對這個報告作了幾點概括性的評論。

Slowly, an image began to appear on the screen.

屏幕上慢慢地出現了一幅圖像。