French language Q&A Forum

Why is it "le résultat en vaut la peine! " Where is the "de" it is replacing?

Hi there;

Can I spell out my difficulty with this?

The three sample sentences are (and I've re-ordered the clauses on one to make my point clear):

Depuis que j'ai quatre ans, je porte des lunettes.

Depuis que vous nous l'avez dit, nous le savons.

Depuis que je t'ai rencontré, ma vie a complètement changé.

In the first two examples, the second clause of each is in the present tense; why not in the third example?

Best wishes,

Hugh