French language Q&A Forum

Bonjour. çe sa? please check the above

Hi! Perhaps someone can clarify a problem I have in distinguishing when to use "de" versus "du".  I don't have any problems distinguishing between "du" partitive (J'ai mangé du pain) and using "de" when the sentence is negated (Je n'ai pas mangé de pain).  But in examples like the sentences I've listed from this exercise (Délicieuse Rédaction), how does one know to use "de" in "mon reste de ragoût" and "du" for "la porte du jardin"?  

Why is there no l' in front of effet in "gaz à effet de serre" so it would read "gaz à l'effet de serre"? Same for "tasse à thé" - no definite article. Yet, you write "pain au chocolat" - definite article.

why in this exercise is the nous form used one time and the on form another when they are both times speaking about what they will do together?

HI,

I was wondering would these two sentences be correct?

1) nous aimons Faire de la randonnée au canada 

2) nous randonnons au canada 

It's not homework just understanding the lesson on here better for practice. 

Thanks

Nicole