I don't recall locking my suitcase.

　　我现在搞不清楚到底有没有锁我的箱子。

　　相同的句子还有：

　　I don't recall who ever told me that.

　　我不记得是谁告诉我这些了。

　　I was in such a hurry this morning that hardly could I recall locking my door.

　　我今天早晨走的太匆忙了，记不起来到底有没有锁门。