Choose the correct sentence. We could clearly see the snow-capped mountains at a distance, We could clearly seen the snow-capped mountains at a distance.

We could clearly see the snow-capped mountains at a distance

We could clearly seen the snow-capped mountains at a distance

Both are correct

Both are wrong

We could clearly see the snow-capped mountains at a distance is the correct one.
We use first form of the verb (see) after modal verb (could).