French language Q&A Forum

While expressing present continous tense or future simple with present tense in french, I realy get confused on when to use auxiliary etre with subject pronoun and when not to use 

What is wrong with the first?

Hi, Can you please help me with this?________ une clé. (I have found only one key.) Why "Je n'ai que trouvé" is not accepted as a correct answer? But Only "Je n'ai trouvé qu'" and "J'ai trouvé seulement" are correct. I checked the theory but I think "Je n'ai que trouvé" is also correct.

It would be good to see some examples with que as well, not just qui or qu'

"If including / [number] of which is followed by a conjugated verb, in French you need to add a relative pronoun (qui or que / qu') in front of the verb"

Are there any patterns to looks for in the verbs that are conjugated with è VS. the verbs conjugated with the (ll/tt) rule? If not, are there any tricks to memorize these select exceptions from the (ll/tt) rule? 

I can't seem to get these two lessons down because I have no rule for distinguishing between the verbs which have distinct conjugations.