BBC Earth 1
Grey herons are not fussy eaters
— BBC Earth (@BBCEarth) November 18, 2023
These carnivorous birds primarily consume fish, however, their diet varies depending on the seasons and food availability. They have been known to eat snakes, amphibians, small birds and even plants.#EarthCapture by Ayan Guin via Instagram pic.twitter.com/kZTOqKwtuJ
They have been known to eat snakes, amphibians, small birds and even plants.
SUBJECT-VERB AGREEMENT
– What is the subject of this sentence?
The subject of this sentence is they.
– Is the subject singular or plural?
They is a plural subject.
TENSES
– What is/are the tense(s) used in this sentence?
They have been known to eat snakes, amphibians, small birds and even plants.
They have been known
Subject + have + been + past participle
This sentence uses the present perfect tense.
ACTIVE vs. PASSIVE
– Is this an active or passive sentence?
They have been known to eat snakes, amphibians, small birds and even plants.
The subject is not the one doing the action.
This sentence uses passive voice.
They have known… (active)
They have been known… (passive)
DEPENDENT CLAUSES
– Is there a noun, adjective or adverb clause in this sentence?
No, there isn’t.
They have been known to eat snakes, amphibians, small birds and even plants.
They
= subject
have been known
= verb phrase
to eat snakes, amphibians, small birds and even plants
= infinitive phrase (object to the verb known)
There is only one main/independent clause.
There isn’t any dependent clause.