Why is good grammar important? Well, good grammar can save lives! Just consider the difference between "Let's eat. Grandma!" and "Let's eat Grandma!" With the first one, you are inviting your grandma over for a lovely meal. The second one sounds like you are excited about cannibalism (同类相食）.
Jokes aside, some people think good grammar is unnecessary. They think that as long as they are being understood, it should not matter whether there are a few grammatical mistakes or not.
（1) I believe good grammar matters.
Thinking about your grammar when you are writing makes you easier to be understood. You may think a grammatical mistake doesn't matter. But think about it from the reader's point of view (观点）. Even a small mistake can make your reader stop and read the message again. (2)
（3) Being able to speak and write correctly, over time, builds your confidence while using English. This will encourage you to increase your vocabulary. With good grammar and a wide vocabulary, you will find it easier to express your ideas and communicate with native speakers (讲母语的人）.
Good grammar can also make you appear more realiable (值得信赖的）. Just think about your attitudes (态度）towards a newspaper that has many grammatical mistakes in its articles. You will doubt (怀疑）if the information in the newspaper is reliable, won't you?
The same is true on a personal level. If there are many careless mistakes, then it appears to readers that you don't care about your work. This makes them less likely (可能的）to trust you.
（4)

A. But I don't think so. B. That will make your writing bad. C. So will you try to learn grammar well? D. He or she will have to spend more time understanding it. E. I hope you have now seen the importance of good grammar. F. Good English grammar will help improve your English skills.

【小题】

A.A

B.B

C.C

D.D

【小题】

A.A

B.B

C.C

D.D

【小题】

A.A

B.B

C.C

D.D

【小题】

A.A

B.B

C.C

D.D