Present tense:
* J'ai vu: This is the most common way to say "I saw" in the present tense, and it implies that you saw something recently or in the past.
* Je vois: This translates to "I see" and implies that you are seeing something right now.
Past tense:
* J'ai vu: This is also the past tense form of "I saw" and it is used for actions that happened in the past.
* J'avais vu: This translates to "I had seen" and it is used to describe an action that happened before another action in the past.
Example sentences:
* J'ai vu un chat dans le jardin. (I saw a cat in the garden.)
* Je vois un oiseau sur l'arbre. (I see a bird on the tree.)
* J'avais vu ce film avant. (I had seen this movie before.)
It's important to choose the appropriate tense based on the context of the situation.