I think it's about confidence, as according to my experience in speaking English, we should have self confidence and know the topic well. Your pronunciation should be very clear like water in the river. I personally like to do this: Whenever I watch a movie and I found a dialogue that I like, I
I'm still confuse about english,, eventhough i've learnt ,, i always stuck in talking english,, i worry about my grammars,, so if i wanna speak i always think first, so slowly.. I think its about confident, as a my experience speak up in english, we should have self confident and know about the t