彼の意見に賛成します。

N5 彼 kare he N4 意見 iken opinion, view, idea N3 賛成 sansei approval, agreement, support

N3 彼 hi / kare, kano, ka.no he, that, the N4 意 i idea, mind, heart N5 見 ken / mi.ru, mi.eru, mi.seru see, hopes, chances N3 賛 san / tasu.keru, tata.eru approve, praise, title or inscription on picture N3 成 sei, jou / na.ru, na.su, -na.su turn into, become, get

N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase