appear的过去式是什么

　　The magazine will appear in a new design from next month.

　　从下月起这本杂志将以新的设计问世。

　　Slowly, an image began to appear on the screen.

　　屏幕上慢慢地出现了一幅图像。

　　These kinds of question often appear in the exam.

　　此类问题在考试中经常出现。

　　A number of thin cracks appeared in the wall.

　　墙上出现了许多细裂缝。

　　The hill appeared as a black mass in the distance.

　　远远地看去，那座山是黑魆魆一片。