一、主谓不一致，例如：She don’t know what to do.
动词的三单形式最是容易被忽略，改正为：She doesn’t know what to do.
二、比较级乱用，例如：Biking is more healthier than driving a car. It is more easy to search information online.
不要笑，每三个学生就有一个常犯这样的错误。
改为：Biking is healthier than driving a car. It is easier to search information online.
三、一个句子里有多个动词，例如：I want go to bed. I like dance and sing.
注意，一个句子里只能有一个谓语动词。所以要把多余的那个换成非谓语的形态哟～
I want to go to bed. I like dancing and singing.
四、动词原形做主，宾，表，宾补等名词性的成分，例如：Swim is my favorite sport. My goal is pass the exam.
改正为：Swimming is my favorite sport. My goal is to pass the exam(注意goal, purpose, dream 等词表示尚未实现的动作，要用不定式).
五、There be 和 has用法混淆，例如：There have a lot of trees in the park.
改正为：There are a lot of trees in the park. 或者The park has a lot of trees in it.
六、可数名词单独使用，例如：Cellphone is useful. I like playing computer game.
可数名词单数不要单独使用哦，可以改为复数指类别，如：
Cellphones are useful. I like playing computer games. 也可以在单数可数名词前加上限定词如this，that;代词所有格如 his, her; 或者加上冠词the, a, an.