Connecting two clauses into one sentence — coordination, conditions, and cause.
ken 'and' joins two clauses (or two words) of equal rank into one sentence — the same word used to join a simple list of nouns.
Nagtúdo ken nagbagyó.
It rained and stormed.
diáy áso ken púsa
the dog and cat
no 'if' introduces a clause that sets a condition for the other clause — the condition clause can come before or after.
Mangán ka no mabisín ka.
Eat if you are hungry.
To say something happened because of something else, gapó ití 'because of' introduces the cause after the main clause — the same construction used for the antecedent complement in verbal sentences.
Nagsángit diáy ubíng gapó ití bisín.
The child cried because of hunger.
To report speech, a clause introduced by nga follows a verb like bagá 'say' — very close to English "that" clauses.
Imbagá na nga mabisín ka.
He said that you are hungry.
Grammar: Ch. 9, Complex & Compound Sentences; Ch. 11.2, from Constantino's Ilokano Reference Grammar (1971, CC BY-NC-SA 4.0).