c Help may also be uscd wilh a fuli infinitive, either alone or afier an object:
I helped (them) (to) carry the injured outside the building.
For can't help meaning cant slup, see 17D.
d Knowmay be used wilh the plain infmitive (after an object) only in the present p meaning 'have had the experience of':
I have known Willic (to) slay up all night working.
In its usual meaning of 'ha ve the knowledge of' know is used with a that clause or infinitive: