Раскройте скобки, употребив глаголы в нужном времени. Предложения переведите.

1. We (to know) him a long time before we (to give) him a position in the accountant department. 2. Nothing satisfies him, he always (to complain)! 3. I'm afraid he (not to realize) the importance of this question yet. 4. By the end of summer we (to complete) the greater part of our task. 5. I never (to see) snow. I hope to see it when winter (to come).