When people speak fast, they link words together. Linking words and phrases in English are used to combine clauses or sentences presenting contrast, comparison and supposition.
- Native speakers of English do this naturally. Learning to correctly link words can result in more fluent sounding English. If you do not know how to use it in a right way, you will sound foreign to them.
e.g. Do you go out, don’t you? (You must say like = donchou?)
e.g. Did you go out last night, didn’t you? (You must say as =di jyou?
- to learn more about it: https://pronuncian.com/introduction-to-linking/