alternate的一般过去时怎么写？

adj.轮流的，交替的，间隔的，代替的vi.交替，轮流vt.使交替，使轮流n.〈美〉（委员）代理人，候补者，替换物...

alternate的第三人称单数（三单）为：alternates...

alternate的音标：alternate的英式发音音标为：[ɔ:l'tɜ:nət]alternate的美式发音音标为：['ɔltərnət]...

The three acts will alternate as headliners throughout the tour...这3个节目将在整个巡回演出中轮流打头牌。Convolutions frequently alternate in direction of rotation and vary in pitch.盘旋经常改变回转方向和节距.His group was forced to turn back and take ...

alternate的现在完成时为：alternated...

alternate的现在进行时为：alternating...