1. We must prevent him from leaving.
The cold wet weather prevented the Lowood girls from going for long walks.
His rheumatism often prevented Salvatore from doing anything at all.
You'd better keep yourself from taking extreme measures.
Various reasons kept Bill from joining the expedition.
Eliza tried to keep her little child from crying.
2. You can't act without feeling.
Jolyon started for the Club without having made up his mind.
Frank now felt, without knowing why, that the offer was probably good.
Rose sat there for a long time without unfastening her coat.
You can't teach one how to use speech patterns without giving a good supply of various examples.
They can't have good crops without cultivating soil.
3. His clothes made him hard to recognize.
Lots of mistakes made his speech difficult to follow.
There was something in Bosinney's appearance that made him easy to recognize.
Her shallow-mindedness makes her dull to speak to.
They found it impossible to supply the factory with raw cotton.
We found it hard to make up our minds about choosing a place for rest.
4. These letters are hardly worth the paper they are written on.
The problem is hardly worth the trouble taken. The picture is of little value, it is hardly worth the money paid.
The experiment is hardly worth the time you've spent on it. The incident is hardly worth all this excitement. The soil was hardly worth the toil.