1 . 单句改错
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
1. Only if we do enough self-protection, we stay away from Covid-19.
2. I’m working on my essay. Would you mind turn down your music a little bit?
3. Sometimes, I start the second declaration first and sometimes, I start the first declaration the second time.
4. Simon is such responsible a boy that he is chosen chairman of the Student Union.
5. As time going by, the virus will probably become weaker and less active.
6. We are still in the middle of 2020, that is considered to be an eventful year.
7. Apart from self-protection, we have no choice but wait for the vaccine.
8. To avoid be trapped in heavy traffic at the rush hour, I usually take the subway to work.
9. Henry became addictive to online games, which had a bad effect on his schoolwork.
10. Quite a lot of species have been died out so far, resulting from urbanization.