Cannot is sometimes also spelled can not. The one-word spelling is by far the more common: Interest rates simply cannot continue at their present level. The contraction can't is most common in speech and informal writing. See also can1.
Examples from the web for cannot
Germans have learned after decades of fighting their expression that the ideas behind them cannot be outlawed.
Student life needs certain autonomy and cannot be organized educationally as strictly accountable activities.
So they can consume many of the long-lived radioactive materials that thermal reactors cannot.
Though they cannot fly, ostriches are fleet, strong runners.
As the world warms up, some species cannot move to cooler climes in time to survive.
You've become at an expert at identifying what plastics you can and cannot recycle.
Seeds cannot germinate until certain favorable environmental conditions are met.
The blimp cannot fly where there is risk of snow and has difficulty transiting over mountains.
Cholera outbreaks seem to be on the increase, but a new study has found they cannot be explained by global warming.
Today you cannot order a coffee, buy a bagel, or pay for a photocopy without being asked to leave your change behind for.
British Dictionary definitions for cannot
cannot
/ˈkænɒt; kæˈnɒt/
verb
1.
an auxiliary verb expressing incapacity, inability, withholding permission, etc; can not
Word Origin and History for cannot
v.
c.1400, from can (v.1) + not. Old English expressed the notion by ne cunnan.