I'm just curious with what has been commented from another post. Do you think there are also some native speakers, let's say with average education, who are not really good in grammar themselves?

I ask because I myself is too conscious about my grammar even in casual conversation that I sometimes fail to listen to what a person is saying because I'm busy constructing correctly the sentence in my mind.

Just sharing my thoughts. Emotion: smile
Certainly as writers, many native speakers are awful. My own brother can barely assemble a sentence. In speaking, it is not such a problem, since speaking comes naturally to all, and the grammar of spoken English is much looser than the written sort. As a learner, you will naturally have trouble until you pass the translation level; after that, you will find it easier and less worrisome to have a natural conversation.
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I see not all are good in grammar especially in writing. What's difficult for non-native speakers like me is sometimes there are no direct translation of some English words to our own language, which makes it harder to express an idea.

Probably, the reason why I get too conscious with my English is most people back in my home country, where English is just a second language, are always on the lookout for errors in a person's grammar and would sometimes make fun of you when, ironically, they themselves are not perfect in their own.

Well, I just hope with my eagerness to learn, I can be as good as native speakers are.

Thanks so much, Mister Micawber, for sharing your thoughts. You're actually one of those I look up to in this forum. More power.
I completely agree with MM. Until one gets past the translation stage, trying to communicate with perfect grammar in a conversation setting will definitely post some problems for non-natives. I can appreciate your being self-conscious. But what I've discovered over the years is that when we are so consumed with using perfect grammar, our ability to comprehend the contents of the conversation is compromised and our speech patterns became awkawrd sounding to the people having the conversation with you. I thought I toss in my 2 cents with my own take.
Thank you, dimsumexpress for sharing your thoughts. I agree with you. Our comprehension is compromised when we are so consumed with using perfect grammar. I sometimes stutter because words in my mind get mixed up. I think it is also a matter of confidence and being comfortable with speaking the language. I believe when you're confident, it makes you come across as natural and sincere to the people you're conversing with. Again, just my opinion.
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Based on what I could gather from your posts, your written skill level suggests that you have spent a great deal of time studying the language. I don't know your nationalility but I can say for certain that English is a highly intimidating language to many Asian peoples as such that many immigrants that I 've known for years still can't speak the language on a grammatical basis, let alone write intelligibly.
I believe your experience and mine are very typical of people trying to master the langauge, but yet seemingly being impeded by our own complex. You mentioned confidence and I couldn't agree more. But the same word "confidence" means a whole lot more to the learners than to the native. For the learners, to develop confidence, they have to overcome many mental and physical barriers. Among them, learning and using correct grammar and building a strong vocabulary, as well as overcoming the mother-tongue complex. That sounds rahter simple, doesn't it? But I can tell you from experience, from learning the "ABC's" to the current level, it has taken over 20 years of continuous polishing and refining the rough spots. Everyone has a different pace of learning as his background, focus, understanding and ability to digest the language varies from others. The importmant thing though is to keep a "never give up" attitude and keep your eyes, ears and mouth open.