My friend came round my house yesterday.
The police officer came round to see if I was okay.
preposition
In the sentence given, "round" is a noun.
The adjective for this sentence is round.
"The ball is round"
a good sentence would be my dog went round and round in circles before his nap
"round" is used to describe the "circle". "circles" is the noun and "round" is an adjective.
How can you use the word round in a sentence as a noun
The Major is a mustang; he came up through the ranks. I want to rope just one mustang during tomorrow's round-up.
The sentence "That was the reason why he came late" is a complex sentence, as it contains an independent clause ("That was the reason") and a dependent clause ("why he came late").
verb
'Did she came...' is incorrect. 'Did she come...' is correct.
It is an action verb.