from time to time意為有時，不時；be different from意為與之不同；come from意為出生於，來自；from door to door意為挨家挨户；from now on意為從現在起，今後；from tip to toe意為徹頭徹尾，完全；hear from意為收到某人來信be from意為來自；from then on意為從那時起；from morning till night意為從早到晚。