Questions & Answers about Деревья раскачиваются от ветра.
Деревья is the nominative plural of дерево (tree).
- Singular:
- дерево – a tree (nominative singular)
- Plural:
- деревья – trees (nominative plural)
Many neuter nouns ending in -о form an irregular plural, and дерево → деревья is one of those irregular patterns.
You use the nominative plural here because деревья is the subject of the sentence: the trees are doing the action (they are swaying).
Раскачиваются is:
- 3rd person plural (они – they)
- Present tense
- Imperfective aspect
- Reflexive (-ся / -сь verb)
Full infinitive: раскачиваться – to sway, to swing, to rock (back and forth).
So деревья раскачиваются literally:
- они раскачиваются – they sway / are swaying.