The activity, the researchers found, had no significant effects on the amount of time the subjects needed to fall asleep.

This means that with an inflected verb the subject does not need to be mentioned.

The subject of world population control needs to come off the taboo list and start to be seriously discussed.

To gain this cursor control, the subjects needed several months of 30-minute training sessions four or five times a week.

The boring subjects of dieting and portion size need never mar the experience.

Comparative is used when two referents are compared to each other but the subject of comparison does not necessarily need to be expressed.

To accomplish this task, the subjects needs to both maintain and manipulate information in working memory.

The subject does not need to be looking at the grenade for it to take full effect in outdoor areas.

Your writer and his subjects need to update their choice of instructive mobster movies.

British subjects and Commonwealth citizens need not give their address.