Translation of "ni" into English

Yigaragaza uko ari, kandi ibyo avuze ni na byo akora.

He is what he says he is, and he will do what he says he will do.

ni Rimwe command ya:, ni Bitunguranye, na ni ya: ibisubizo

There is one command that rolls dice for you, it is called random, and it is very useful for some unexpected results

Naho umugabo agiye guhura na we ni Isaka.

And the man she is coming to meet is Isaac.