The enemy was the one who had been preventing him from completing his mission for so long.

His many occupations prevented him from ever completing the book.

However, illness prevented her from completing the trip and she died the following year.

They only had minutes, on their time scale, to prevent the machinery from completing its work.

If something prevents you from completing an activity, don't worry.

These conditions usually improve within a few weeks and rarely prevent patients from completing the program.

Vomiting may prevent you from completing the test on that day.

However, they are criticized for their highly difficult level, which prevent players from completing the whole game.

He just wanted to prevent her from completing the Monster mission.

This did not, however, prevent him from completing the several stages of Italian school.