underpin
过去式:underpinned
过去分词:underpinned
现在进行时:underpinning
词形变化:
动词过去式: underpinned | 动词过去分词: underpinned | 动词现在分词: underpinning | 动词第三人称单数: underpins |
underpin
过去式:underpinned
过去分词:underpinned
现在进行时:underpinning
词形变化:
动词过去式: underpinned | 动词过去分词: underpinned | 动词现在分词: underpinning | 动词第三人称单数: underpins |