Exodus 3:3 New English Translation

³So Moses thought,^[a] “I will turn aside to see^[b] this amazing^[c] sight. Why does the bush not burn up?”^[d]

Exodus 3:3 tn Heb “And Moses said.” The implication is that Moses said this to himself.
Exodus 3:3 tn The construction uses the cohortative אָסֻרָה־נָּא (ʾasura-nnaʾ) followed by an imperfect with vav (וְאֶרְאֶה, v^eʾerʾeh) to express the purpose or result (logical sequence): “I will turn aside in order that I may see.”
Exodus 3:3 tn Heb “great.” The word means something extraordinary here. In using this term Moses revealed his reaction to the strange sight and his anticipation that something special was about to happen. So he turned away from the flock to investigate.
Exodus 3:3 tn The verb is an imperfect. Here it has the progressive nuance—the bush is not burning up.

New English Translation (NET)