我爱的是你。(Who i love is you you you , not her )
我买的是最好的。(what I bought is the best。 if you say 我买了最好的。 it has no emphasis )
Just emphasizing
你误解了,我说的是。。。。
我点的是。。。。结果。。。。
It doesn't necessarily follow the result, but this sentence requires a reason or result to emphasize your sentence.
I totally agree with what Nancy said ...
actaully it is like : what I said is that......
so it could be like :what I ordered is that...