So, in connected speech, we can only connect A with B if A is "a strong or weak word" & B is "a weak word", right?

Question

I discovered this rule in connected speech. I asked this question many times but seem no one has a proper answer. See this saying at **11:45** in [this video](https://www.youtube.com/watch?v=828-I8GsV1o&feature=youtu.be&t=11m45s) "*My room is on the fifth floor. I had to walk up with my luggage.*" There is a linking between "***is-on***" `/ɪzɔːn/` since "**is**" & "**on**" are both weak. However, there is no connection between "**walk**" & "**up**" since "**up**" is emphasized. However, see [this video](https://www.youtube.com/watch?v=tYx_pTuLvmE&feature=youtu.be&t=3m17s) at **3:17**, the lady said "*I'll call Oliver*". There is a connection between "**call**" & "**Oliver**" `/kɔː'lɒl.ɪvɚ/`, so I predict that "**Oliver**" is not emphasized or is weak! So, from these above research, I can conclude that: There will be a connection between **A** & **B** (**A** stands before **B**), for Example "**Wake up**" (**A**: wake & **B**: up), if: - **A**: strong word & **B**: weak word - **A**: weak word & **B**: weak word There will be **NO** connection between **A** & **B**, if: - **A**: strong word & **B**: strong word - **A**: weak word & **B**: strong word I asked this question many times but seem no native English speaker could provide a proper answer. **I will thank you so much if any of you can provide a proper answer for it!** **Note**: I think a strong word in a sentence is the word that we want to emphasize & we really want the listener to hear that word. The strong word is the word that is very important in a sentence. On the contrary, weak word is the word that is not very important in a sentence & we don't want to emphasize it.

Answer 1

Honestly speaking, the only time I heard of STRONG-weak idea is the vowels. A, E, O are strong. I, U are weak. If you ask the same question to English teachers, they may give you the same answer I gave you. In all the years of studying English, I never had a teacher show me strong and weak words.