The Correct spelling is: cannot
Common misspellings of the word cannot are:
How do you spell cannot?. It is not cannnot
The negative form of can1.
USAGE NOTE The idiomatic phrase cannot but has sometimes been criticized as a double negative, perhaps because it has been confused with can but. The but of cannot but, however, means â€œexcept,â€ as it does in phrases such as no one but, while the but of can but has the sense only, as it does in the sentence We had but a single bullet left. Both cannot but and can but are established as standard expressions.Â â€¢Â The construction cannot help is used with a present participle to roughly the same effect as cannot but in a sentence such as We cannot help admiring his courage. This construction usually implies that a person is unable to affect an outcome normally under his or her control. Thus, saying We could not help laughing at such a remark would imply that one could not suppress one's laughter.Â â€¢Â The construction cannot help but probably arose as a blend of cannot help and cannot but; it has the meaning of the first and the syntax of the second: We cannot help but admire his courage. The construction has sometimes been criticized as a redundancy, but it has been around for more than a century and appears in the writing of many distinguished authors.Â â€¢Â The expression cannot (or can't) seem to has occasionally been criticized as illogical, and so it is. Brian can't seem to get angry does not mean â€œBrian is incapable of appearing to get angry,â€ as its syntax would seem to dictate; rather, it means â€œBrian appears to be unable to get angry.â€ But the idiom serves a useful purpose, since the syntax of English does not allow a logical equivalent like Brian seems to cannot get angry; and the cannot seem to construction is so widely used that it would be pedantic to object to it. See Usage Notes at but, help.