This can be translated with an active verb. This is a command. By commanding that the waters gather together, God made them gather together. Alternate translation: "Let the waters ... gather" or "Let the waters ... come together" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-imperative]])
The water had covered the land. Now the water would move aside and some of the land would be uncovered. This is a command. By commanding that dry land should appear, God made it appear. Alternate translation: "let dry land become visible" or "let the dry land become clear" or "let the land be uncovered" (See: [[rc://en/ta/man/translate/figs-imperative]])
"It happened like that" or "That is what happened." What God commanded happened just as he said it should. This phrase appears throughout the chapter and has the same meaning wherever it appears. See how you translated it in [Genesis 1:7](./07.md).