Homework:
학생이 쓴 원문
강사 첨삭
Hello Miss. [Name]! Technology has changed a lot of things in our daily lives. It was absolutely different from the past. At the present, smartphones are really necessary. ~~T.Dee
I have used my cell phone since I was 20 years old.
>>CORRECT!
>>OR: I started using a mobile phone since I was 20 years old.
Before cell phone, I used a beeper.
>>Before I used a cell phone, I used a beeper.
Before using a cell phone, there was a city phone, but it was not necessary for high school students to use.
>> Before using a cell phone became popular, there was a city phone. But at that time, it was not necessary for high school students to use one.
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