Sherlock Holmes is my favorite book and its drama is awesome. Sherlock Holmes is my favorite book and its drama is awesome.

I try to watch without Japanese subscripttitles, however it is difficult for me because the casts speaks so fast. I try to watch without Japanese subtitles, however it is difficult for me because the cast speaks so fast.

Often we use the term subtitles in the US The cast already refers to a group of people, so it would only be plural (casts) if you referring to multiple sets of casts Speaks is plural since multiple people (the cast) are speaking

I try to watch without Japanese subscripttitles, however it is difficult for me because the casts speaks so fast. I try to watch without Japanese subtitles, however it is difficult for me because the cast speaks so fast.

I try to watch without Japanese subscripttitles, however it is difficult for me because the casts speaks so fast. I try to watch without Japanese subtitles, however it is difficult for me because the cast speaks so fast.

I keep on trying to hearlisten and catch the sentences. I keep on trying to listen and catch the sentences.

"Hear" is similar to 聞こえる. "Listen" is similar to "聴く" "To hear" is something you do passively. "To listen" is something you do actively. For example: "I hear the people talking." means the people are talking and their voices are audible. "I listen to the people talking." means, you are intentionally paying attention and trying to understand their conversation.