例如:Youth is not a time of life, it is a state of mind, it is not a matter of rosy cheeks, red lips and supple knees, it is a matter of the will, a quality of the imagination, a vigor of
I wake up only if the alarm clock rings. 只有闹钟响了,我才会醒。If only the alarm clock had rung. 当时闹钟响了,就好了。If only he comes early. 但愿他早点回来。辨析only if 与 if only only与i