stand的過去式形式怎么寫

　　Students stood around in groups waiting for their results.

　　學生們成群地站在周圍等待成績。

　　We stayed in a village where time has stood still.

　　我們待在一個時間似乎凝滯了的村子里。

　　He stood still, absorbing every detail of the street.

　　他一動不動地站著，不放過街上的每一細微之處。

　　Without speaking, she stood up and went out.

　　她沒有說話，站起身來走了出去。

　　The children all stood in a line.

　　孩子們全都站成一排。