to be capable of · to be able to · can

Thanks to the development of agricultural science, world food production has managed to keep up with population growth - but only at the expense of the future.

I wish I could go to Japan.

America, we have come so far. We have seen so much. But there is so much more to do. So tonight, let us ask ourselves, if our children should live to see the next century, if my daughters should be so lucky to live as long as Ann Nixon Cooper, what change will they see? What progress will we have made?

It won't be easy to find someone capable of taking his place.

Nobody can solve this problem.