- This is a very useful arrangement.
Other parts of speech are:
This - demonstrative pronoun
Is - verb
A - indefinite article
Arrangement - noun
- They walk quite fast.
In this example the adverb ‘quite’ is describing the other adverb ‘fast’.
Other parts of speech are:
They - Personal pronoun
Walk - verb
I also think that is an important information that the conjunctions can be coordinating, subordinating and correlative.
- When Robert teaches his classes, his wife feeds the cats.
In this sentence, the subordinating conjunction ‘when’ connects two parts that don’t have equal importance. The part with the conjunction, is not a complete idea.
Other parts of speech are:
Robert - proper noun
Teaches - verb
His - possessive adjective
Classes - noun
Wife - noun
Feeds - verb
The - definite article
Cats- noun