They can keep a record of all of the important dates
他们可以记录下重要的日子。
He can't come and he sends his apologies.
他为他的不能前来致歉。
The reader's hair stands on end when he reads in the final pages of the novel that the heroine a dear old lady who had always been so kind to everybody, had, in her youth, poisoned every one of her five husbands.