Possible answers:
<em>The</em> branches swayed in the breeze.
article
The <em>branches</em> swayed in the breeze.
noun
The branches <em>swayed</em> in the breeze.
verb
The branches swayed <em>in</em> the breeze.
preposition
The branches swayed in the <em>breeze</em>.
noun
hope this helps
Cause and appear because these words need to be singular since the other words are plural
