Don‘t waste your time on a man/woman,who isn‘t willing to waste their time on you.Sometimes you need to look back,otherwise you will never know what you have lost in the way of forever searching.才两句，要句型和结构As long as we maintain a positive attitude, you can.....Life will always encounter difficulties and setbacks many, but we must not lose heart, want to believethere is a rainbow after the wind.人生中总会遇到许多的困难与挫折，但是请不要灰心，要相信风雨过后总会有彩虹。