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1. I think that we would go to that restaurant this Friday night.
2. I feel that we would go to that restaurant this Friday night.
3. I guess that we would go to that restaurant this Friday night.

When I wrote a thread and raised here, someone taught me that I had better not omit the conjunction "that" in the thread. Since then, I've all the time used "that" whenever speaking and writing. At that time, I also felt that since I'm a foreigner, I had better use the conjunction "that" all the time to make the meaning of my sentences more clear. In fact, when speaking, adding the conjunction "that" is more convenient for me.

But, today, Oh~. when I saw some movies, whether actors and actresses so often omitted the conjunction "that". What do I do? Let me ask you for this problem. I'm a foreigner who has a limitation to imitate your accent and intonation. ( In fact, these days I'm focusing at only using English under correct grammar).

Is it better for me to add "that"? If not, could you teach me like this? In case of speaking "I feel, I think,I guess or something" I don't need to add the conjunction "that", in the other cases, I had better add "that"?

Thank you in advance for your teaching.
Comments  
'that' is optional.
I've wanted to hear that answer. Thank you for your answer, Yoong Liat
Students: We have free audio pronunciation exercises.
You're welcome, James.