Because.
Indicates that that expressed in the second sentence is the cause of that expressed in the first.
Momollo' hi Wīgan ede han nihināna ti mi'id mamāngon ay hiya.
Wīgan kept on sleeping there where he stayed because no one awakened him.
A dependent sentence with ti commonly follows a dependent sentence with manu ay.
Manu ay alyon Tittīlong ti inīlana an hiyay ma'ābak.
The reason Tittīlong said (that) (was) because he knew that he would be the one to be defeated.
See sec. 7.26.1.4.