Longer Form of Comparisons

Question

I'm having a bit of trouble figuring out the use of lo in comparisons of inequality. Here is how it seems to work. Please, anyone who is willing, let me know what I have wrong.

In comparisons when the second part of the comparison has a verb other than the one used in the in the first part you use a longer form of the comparison. (Rather than más noun/adj/adverb que)

De el/la (los/las) que, or de lo que.

(when using the longer form of comparison Adj or Adv = lo)
Dan es más feo de lo que cree.
Sarah habla más despacio de lo que piensa. (No creo que "piensa" es la mejor palabra, intento decir "than she thinks" como "She speaks slower than the speed at which she uses her mind to think.)

(nouns = el/la, los/las)
Mary tiene más amigos de los que gustan su esposo.

With Superlatives it is a little bit easier.
Adjectives use el/la, los/las, and adverbs use lo.

Answer 1

Dan es más feo de lo que cree.

Sarah habla más despacio de lo que piensa. (No creo que "piensa" sea la mejor palabra,... Es perfecta.

(nouns = el/la, los/las)

Mary tiene más amigos de los que le gusta a su esposo.

Your comparisons are ok, but you have used "gustar" the other way around.