6 The LORD said, “If as one people speaking the same language they have begun to do this, then nothing they plan to do will be impossible for them.

Read Genesis 11:6 Using Other Translations

And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do.
And the LORD said, "Behold, they are one people, and they have all one language, and this is only the beginning of what they will do. And nothing that they propose to do will now be impossible for them.
“Look!” he said. “The people are united, and they all speak the same language. After this, nothing they set out to do will be impossible for them!