"Yes I have" -> "Yes, I have." "Once I dreamed about I stood on the edge of cliff," -> "Once, I dreamed about standing on the edge of a cliff," "and someone was chasing me and want to kill me." -> "and someone was chasing me and wanted to kill me." "As soon as he caught me suddenly I woke up." -> "As soon as he caught me, I woke up." or "He caught me and I suddenly woke up." Notes: For the "Once, I dreamed..." sentence, you might consider making it into two separate sentences: "Once, I dreamed about standing on the edge of a cliff. Someone was chasing me and wanted to kill me." The last sentence only needs to reference the time you woke up once; use either 'suddenly' or "as soon as" but not both. Finally, consider that there's a disconnect; you are standing at the edge of a cliff, but you are also being chased. Are you not running away? Were you running, but then you reached the cliff?

Thanks for your correct, Jan.

"One I dreamed about I stood on the edge of cliff". This is a fragment sentense, you used "I" twice on the sentence. This could be revised by saying "There was one time that I had a dream about standing at the edge of the cliff". Hope this will help you. lol