Answer:
The subject that agrees with the verb help is: feathers
Step-by-step explanation:
In the given statement:
[(The bird) (is losing the feathers that help to keep it warm).]
We can see the following analysis:
- SUBJECT: the bird
- PREDICATE: is losing the feathers that help to keep it warm
- DIRECT OBJECT TO THE VERB LOSE: the feathers that help to keep it warm
The DIRECT OBJECT in this case is a THAT-clause with SUBJECT AND PREDICATE:
- SUBJECT: the feathers
- THAT: relative pronoun that refers to THE FEATHERS
- PREDICATE: help to keep it warm
According to this analysis, we can say that there is subject-verb agreement between the elements FEATHERS (noun subject) and HELP (verb).