1. She and he cried seriously last night.
Pronoun- she and he
Conjunction -and
2. I saw stunning ocean and the children was playing happily at the shore.
Adjective -stunning
Adverb - happily
3.Look!! He is dancing on the mountain.
Interjection - Look!!
Preposition -on
4. We go hiking and taking photos.
Verb-go
Noun-photos