I watched as the bird flew by. (Past tense of watch, so something that you already saw)
I sat there and watched the balloon deflate
They sat there and watched the bomb explode into pieces.
I watched the replay of the winning touchdown.
Today I watched episode 5 of the show.
Example sentence - We quietly watched the doe and her fawn walk in the meadow.
Contentedly is an adverb. Adverbs can modify verbs, other adverbs, and adjectives. When you use it in a sentence, it will necessarily be used to describe something. An example of the use of contentedly in a sentence: The mother watched contentedly as her children slept peacefully. In this example, contentedly describes how she watched her children.
looking out the window i watched as the slatternly woman shuffled by
I watched closely as the butterflye emerged from its crystallise.
They watched as the campers pushed their canoes into the river.
I watched the newscast at 5 o clock
I watched the builders put down precast on the ground.
I watched the eagle swoop down and snatch the rabbit from the field.