37 The construction is emphatic, using the cohortative with the infinitive absolute to strengthen it: עָלֹה נַעֲלֶה (’aloh na’aleh, “let us go up”) with the sense of certainty and immediacy.
38 The perfect tense with vav (ו) consecutive brings the cohortative idea forward: “and let us possess it”; it may also be subordinated to form a purpose or result idea.
39 Here again the confidence of Caleb is expressed with the infinitive absolute and the imperfect tense: יָכוֹל נוּכַל (yakhol nukhal), “we are fully able” to do this. The verb יָכַל (yakhal) followed by the preposition lamed means “to prevail over, to conquer.”

In other versions

ESVEnglish Standard Version

But Caleb quieted the people before Moses and said, “Let us go up at once and occupy it, for we are well able to overcome it.”

NIVNew International Version (2011)

Then Caleb silenced the people before Moses and said, “We should go up and take possession of the land, for we can certainly do it.”

CSBChristian Standard Bible

Then Caleb quieted the people in the presence of Moses and said, “Let’s go up now and take possession of the land because we can certainly conquer it!”

NLTNew Living Translation

But Caleb tried to quiet the people as they stood before Moses. “Let’s go at once to take the land,” he said. “We can certainly conquer it!”

LEBThe Lexham English Bible

And Caleb silenced the people before Moses and said, “Surely, let us go up and let us take possession of it because surely we will be able to prevail over it.”

KJV 1900King James Version

And Caleb stilled the people before Moses, and said, Let us go up at once, and possess it; for we are well able to overcome it.

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