since ..., seeing that ..., now that ..., once ...
Verb informal form +
Used to connect two clauses to show a strong logical or natural consequence. It means 'since', 'now that', or 'as long as'. It implies that because the first statement is a fact, the second statement naturally follows as a duty or strong resolution.
Verb (Informal Form) +
Attaches directly to the informal plain form of verbs, in either present or past tense.
約束した
Since I made a promise, I will definitely keep it.
参加する
Now that you are participating, you should try your absolute best.
Noun + である +
When using a noun, the formal copula verb である is used before
親である
Since you are a parent, it is natural to protect your child.
The particle は is optional and simply adds emphasis. The sentence following this grammar point usually expresses the speaker's determination, obligation, advice, or judgment, often translating to concepts like 'must', 'should', or 'will'.