1. No, it’s incorrect. It should be: 我在冬天去爬了山。 Verb+了+noun 爬了山，吃了饭，刷了牙 etc 2. 在毕业以前 before graduation; 在……以前/之前 before… 3. 赢 means win. 球means ball. 赢球 means win or win the game. 4. 早上 is colloquial expression. 早晨 is the written form. Usually we say 早上好 （good morning） instead of 早晨好。 5. They are interchangeable.

1——我在冬天去爬山了。 2——在...以前is a adv,meaning before. 因为明年就要毕业了，应该在毕业以前找好工作。 3——球means ball. 赢球的时候他们很高兴。 4_what does difference between 早上and早晨? 早上 is informal，早晨is formal.Usually we say 早上好，rather than 早晨好. 5_what is difference between "不谢，不用谢and不客气”? They are same.